Connect with us

Features

Managing Food crop pests without compromising yield and environment

Published

on

By DR. Chandrasiri Kudagamage

Insect pests cause substantial damage to our food crops. Insecticides are normally applied to combat them. However, dependency solely on insecticide for pest management has resulted in various undesirable environmental and human health problems. Human health is affected by the consumption of food with insecticidal residues. Also, the destruction of friendly insects such as pollinators, predators and parasites, is among some of environmental effects of indiscriminate use of insecticides. Long-term persistence of some chemicals in the environment and frequent exposure to these chemicals may also result in different forms of cancers. Sri Lanka ranks very high as regards pesticide-related health hazards and around 20,000 poisoning cases are reported per year and of them 1,600 are fatal. Seventy percent of them were related to suicide. (Registrar of Pesticide)

With the development of herbicide resistant crops like soya bean, corn and wheat the use of total weed killer glyphosate has increased and become most widely used herbicides in history. Farmers, in 2014, sprayed enough of the chemical to cover every acre of cropland in the entire world with nearly a half- pound of the herbicide, according to a 2016 study published in Environmental Sciences Europe. With this intensity of use glyphosate is likely to cause problems and as a result, this herbicide is being increasingly scrutinised for human health impacts. Scientists say it also could be altering the wildlife and organisms at the base of the food chain.

DDT was a widely used insecticide during post world war times. The popularity of this insecticide was due to it less acute toxicity. However, it was subsequently known that this insecticide accumulated in the fat layer of fish and mammals. It was banned in 1970s in our country. However, the use of insecticides continued and many farmers believed chemicals are important input for reducing yield losses.

Undesirable effects of chemicals came to be realised worldwide shortly after the wide use of agro-chemicals in post-world war times. Famous environmentalist and a marine biologist by profession, Rachel Carson in her book, ‘Silent Spring 1962’ highlighted the bad effects of indiscriminate use of chemicals. This inspired grass root environmental movements and others to highlight these effects in various forums. Carson did not anticipate a total ban on pesticide. However, she predicted consequences of over use of chemicals on biodiversity and target pests developing pesticide resistance etc. This led to establishment of environmental protection agency(1970) by an executive order from US President Richard Nixon. The purpose of this agency was to protect human health and environment. Similar legislature also being adopted in our country. The pesticide law 33 of 1980 was enacted to regulate import, manufacture, distribution and use of agro-chemicals in Sri Lanka.

 

Alternative Approach

 

To address the above issues new concept of pest management popularly known as Integrated Pest Management or IPM was launched and it evolved into an Eco-friendly and economical pest management tool. This approach has been recognised as a policy for the management of pests by successive governments. However, enough funding in the form of manpower, funding for conducting research, laboratory and analytical facilities has been limiting. This has slowed the progress of IPM in pest management in several crops.

The primary objective of IPM is to develop an economical eco-friendly pest management package where pesticides are used as the last resort when other control measures fail and the pest population exceed a certain threshold called the economic threshold. IPM integrate well with other available control methods and can be applied to any ecosystem such as crop based, home garden, greenhouses and domestic pest control.

Following globalisation and transboundary movements of food and with the increase of demand for diverse food, there has been a concern for contamination of food with various pathogens and chemical residues. Hence agriculture practices need to be introduced to minimise these effects. Recently-introduced Good Agriculture Practices (GAP) fulfil this requirement and goes beyond the scope of IPM.

IPM has various components such as mechanical control (use of bags for fruit fly control), use of resistant varieties, biocontrol (use of predators, parasites and microorganism) and legislative and quarantine (banning of imports from infested country).

 

IPM experience with major food crops

 

There are about five or six major insect pests in our staple crop rice. These pests infest different stages of the crop. Among the pests, rice brown planthopper (BPH) and rice gall-midge play an important role causing low to high of damage depending on the prevailing climate. Due to the cultivation of resistant varieties the incidence of rice gall-midge was very low compared to the times when susceptible varieties were cultivated. With respect to rice brown planhopper , the first resistant variety was introduced to farmers in 1980s. Although resistant varieties are ideal as an insect management method, evolution of new strains that can attack these resistant varieties remain a problem. This has happened with respect to gall-midge resistance where resistance broke down in rice varieties cultivated in the 1980s. However, rice breeders and entomologists were able to introduce a new resistant variety by 1984. There are reports of breaking down of this resistance in the recent times. This indicates importance of constant attention in monitoring resistance, management of resistance and finding new sources of resistance. The availability of molecular genetic tools make it easy for the incorporation novel forms of resistance, which is more stable.

The pests that attack at the seedling stages such as thrips are best approached by following correct planting time as heavy infestation is observed in late planted crop. With respect to rice bug which infest crop after flowering, use similar planting time in a Yaya, weeding around the bunds before weeds flower are important non-chemical methods

Although IPM in rice is fairly successful, it is not widely applied in vegetables and other crops. A study conducted by the Department of Agriculture (DOA) in four major vegetable growing Districts in Sri Lanka showed that 85% of farmers in the Badulla District applied pesticides to their crops before the appearance of any pests or symptoms. In the Nuwara-Eliya District this was recorded at 66%. This shows that chemical controls are used even before pest damage has exceeded economic threshold levels and the use of pesticides as a precautionary measure has become common.

Cucurbit fruitfly and melon fly infestation is the most common limiting factor in the cultivation of cucurbit crops for local consumption and export. The melon fly lays eggs deep inside the fruit. The emerging larvae feed inside the soft tissue. This results in fruit dropping and decay. The larvae pupate in soil. Insecticide control is difficult since larvae feed inside the fruit and avoid direct contact with insecticide. In the export consignment, if a single larva is present the whole consignment can get rejected. Therefore, alternative control strategy based on IPM concepts are required. There are several strategies such as bagging of fruits, collection of crop residues and decaying and fallen fruits into a black polythene bag which help to destroy the larvae due to heat developed inside the bag. Together with these cultural methods, application of protein bait is an innovative approach to control this pest. The female flies are attracted to protein substance and consumption of protein help to mature their eggs. Proteinous material prepared from locally available substances are mixed with soft insecticide and applied to leaves instead of fruits. To reduce the amount of insecticide used application to few spots of the crop is sufficient to reduce the female melon fly population. For more effective results these IPM methods need to be applied on wide area basis such as Yaya or cropping area.

Mealy bug was reported to infest papaya fruits in different parts of the country in the late 1980s. This insect is a invasive pest rapidly infesting many species crops. However, main host is papaya. Due to its rapid multiplication rate and wide host range insecticide control is not successful. In other countries where this insect was found, the population of mealy bug is kept at lower level because of the action of the predators and parasite. DOA has already released a effective parasite obtained from United State Department of Agriculture’s Animal and Plant Health Inspection Service parasite rearing facility, in areas where this pest was found.

In Dec. 2018, another pest Fall Army Worm was observed infesting maize in all major maize growing areas. It was also found to infest sugar cane. This pest is native to America. Outside its native habitat it was first found in Central and Western Africa in 2016, and then quickly spread to sub Saharan Africa and in 2018 it was reported from many Indian states. It is a good example of trans boundary movement as the adult moth is capable of flying hundred of kilometres per night. Also, in the absence of native parasites and predators, other control methods based on IPM concepts need to be developed. Initially, experience of small farmers of South America, where the pest is endemic will be valuable tool for the development of control methods. However, research and farmer awareness programme is of paramount importance to develop more realistic management programme for this new pest.

Taking IPM into farmers’ fields

Many believe the concepts developed in IPM is too complex for the average farmer to understand because it involves counting, record keeping and various calculation for economic threshold determination. Hence, farmers need to be introduced to simpler approach to study the crop growth, pest infestation and natural enemy abundance. This is achieved by a group-based learning process. This is known as the Farmers’ Field School. According to this method around 20- 25 rice farmer groups collectively, study the progress of their crop from establishment to harvesting. For this farmers meet together once a week and observe their fields and share their experience with respect to growth of the crops and those factors that limit the growth including the action of pests, and abundance of natural enemies, etc. Depending on the outcome of the observation of their fields, decision will be taken to take action if the pest population grows up. This is a learner centred process where the agriculture instructor is only a facilitator. The impact of this programme was felt by the increases in yield, reduced insecticide use and favourable bio-diversity factors like abundance of predators and parasites.

Apart from government extension, NGOs such as Sarvodaya, CARE and Sri Lanka Red Cross have provided their support on IPM by conducting training programmes on IPM, but, focusing mainly on paddy.

 

Pesticide Management

A comprehensive pesticide control procedure in the form of pesticide law 33 of 1981 is in existence in the country, but enforcement is low due to several reasons. Often advice regarding pesticide selection was given by the pesticide seller in the village. As a result farmers may select the wrong pesticide, Over use of pesticide is common. They do not use correct dose and dilution. Often they apply pesticide even before appearance of the pest. Also, they do not follow correct post harvest interval. Although, provisions are available to mitigate these shortcomings via the pesticide law, the best way to tackle is through farmer training based on a good extension program.

Under the pesticide law, every product imported to the country has to be registered. Further field monitoring and enforcement of correct use, laboratory testing for quality and residues, imports regulations in the form of banning and restricting the pesticide are carried out. Over the years, the use of WHO Class1 pesticides has been prohibited and these products banned.

Instead of conventional pesticide, there are several specific pesticide registered in the country having low toxicity to humans. Some of these products affect insect hormone system and hence specific to them. Also, available in the market are several neem based botanical pesticide which are effective particularly on caterpillar pests. Additionally, there are bacterial insecticides which result in gastric problems in insects. Insect become sick and die when they consume leaves treated with these insecticide. These insecticides act on few species of insects and easily break down when exposed to light and other environmental factors. Hence, these products are not very popular with farmers although they are safe and environmentally friendly. For these specific pesticides, there are opportunities for use in home gardens and in greenhouses

 

Future development and promotion of IPM

There are several shortcomings in the development and implementation of IPM. There is a dearth of trained extension workers to deal with large number of farmers involved in crop production. To address this issue, leader farmers can be trained in IPM methods and they can be used to train other farmers in a Yaya or in a village. The government extension workers can be facilitators in this training programme as explained above with respect to Farmers’ Field School method of training. However, more intensive training programme for extension workers covering many aspects of IPM and successful experience of IPM particularly from rice IPM programme needs to be integrated into their training curriculum. Farmer field school programme has been adopted in many countries the world over and the knowledge is shared in the form of reports, videos, manuals, field guides and podcasts. Hence there is lot of avenues to incorporate relevant information in the training curriculum of the extension workers in our country.

Consumer awareness of environmental and health hazards of pesticides and particularly of the persistence in the environment needs to be created to reject food contaminated with pesticides. For this facilities for pesticide residue analysis needs to be improved.

Field demonstration of IPM methods with the involvement of researchers, extension workers and farmers needs to be established. By following IPM methods used in these demonstration, farmers can pick up the most appropriate IPM methods to test in their fields. More investment is needed to promote innovative research such as melon fly control as explained above. Participatory IPM trials and development of simplified IPM packages for major pests and diseases are also necessary for popularising IPM among farmers.

Globalisation of trade and travel, and introduction of improved planting materials can cause accidental introduction of pests. Papaya mealy bug and fall army worm are recent examples of such pest introduction. Facilities available at the plant quarantine station need to be improved for identification of pests of quarantine significance.

There is also an increasing interest in utilising information technology in agriculture to help extension advisers and other intermediaries in delivering up to date information to farmers to manage their crops. Development Mobile Apps that work offline for early warning and surveillance of pests helps farmers make quick decisions for the management of pests.

Author is Former Entomologist, FAO Rice IPM project’s Research coordinator, Director Horticulture Research and Development Institute and Director General Department of Agriculture



Continue Reading
Advertisement
Click to comment

Leave a Reply

Your email address will not be published. Required fields are marked *

Features

Universities, as centres of learning, must not be politicised

Published

on

Prof. Goonesekere at the launch of the G. L. Peiris Trust

“They must foster the abiding values of freedom of thought and expression, respect and tolerance for viewpoint difference …”

Address recently delivered by Professor Savitri Goonesekere,
former Vice-Chancellor and emeritus Professor of Law of the university of Colombo,
at the establishment of the Prof. G.L. Peiris Trust for Legal Education and Research.

Thank you, Professor Peiris, for inviting me to speak this evening at an event to announce the endowment that is being made to the University of Colombo and the Sri Lanka Law College as the G. L. Peiris Trust for Legal Education and Research.

You and I have walked the corridors of this beautiful building as Vice Chancellors of this university. The walls of the Senate Room carry our portraits, but do not reflect the experiences that we have had in that capacity. We worked in this institution and chaired Senates and Councils. These fora were places that gave us an opportunity to respect viewpoint differences that were shared in an environment of collegiate connectivity, often in challenging times, when violence in armed conflict was a lived experience for all Sri Lankans.

This is also an occasion to share with this audience a day in this building when you had to confront the horror of the assassination of your predecessor, Professor Stanley Wijesundere, just across from your office. This was summary justice by the then JVP for taking decisions in academic bodies of the university in medical education. I was at the time Dean of the Faculty of Humanities and Social Sciences at the Open University in Nawala. Yet we connected across Universities, supported each other to cope with those dark times. You, as Vice-Chancellor of this University, and my Vice-Chancellor, the late Professor Dayantha Wijesekere, collaborated to network and respond to violence against staff and students from non-state and state actors. University Teachers for Human Rights was born at this time with the support of both Vice-Chancellors.

Some years later, as I walked up the stairs of College House, on what I expected to be a routine day, a colleague ran down that staircase to say that a former student and cherished friend, Dr. Neelan Tiruchelvam, had just been assassinated. Devastated as I felt, I had no inhibitions in speaking later at his funeral, in what had been a political assassination. I did not have to ask for permission from the University Council to do so.

Today, freedom of thought and speech in academic institutions is being challenged in the United States and our own country in restrictive norms on governance of public institutions. These events of the past and that history are an eloquent reminder that Universities, as centres of learning, must not be politicised. Rather, they must foster the abiding values of freedom of thought and expression, respect and tolerance for viewpoint difference, and bring that voice to both University fora and the public domain. In those times, professors and law teachers did not have to explain to Vice-Chancellors and Deans why they expressed views within and outside Universities on issues of public concern.

Today is a day to also recall Professor Peiris’s own scholarship in the area of public law and particularly on freedom of speech and expression that preceded the dramatically different career path he chose to take. That scholarship will now be available to generations of law students, teachers and lawyers, as well as others, hopefully inspiring an understanding and reflection on fundamental legal principles and concepts that can contribute to the wellbeing and sustainable development of a nation.

The literature and your scholarship that will be shared through the G.L. Peiris Trust will also hopefully be a reminder that “one must know the law as it is, to comment on what it should be”. For your early scholarship is very much in the tradition of analytical positivism that you and I were immersed in as students of the one and only Law Department in Peradeniya and later in this university. We pulled what are called “all-nighters”, as students and teachers, reading in our rooms or in that wonderful library in Peradeniya, referring cases, statutes, Grotius and Voet, the jurists of Civil Law, and of course the great Common Law and Civil Law scholars like Ivor Jennings, H. L. A. Hart, and R.W. Lee.

Professor Peiris, as you all know, came into the University with a stellar record from that institution near the Indian Ocean, where, (as loyal Royalists would have it), scholar students were not the norm. Coming into a University with a scholar’s record does not necessarily translate to a stellar University career. Professor Peiris, with his prodigious capacity for academic work, clarity of thought and writing, thrived in that new learning and teaching environment. He made history in the Law Department, winning every scholarship awarded and graduating at that time with the much prized first-class honours degree. I myself was a young law teacher at the time, and recall that it was impossible to grade GL’s papers with any grade but an A. The length of those contributions, of course, required exhausting attention, and I think taught his teachers to learn how to read carefully. My young grandchildren cannot read a long email from me today without missing a lot of its content!

The G. L. Peiris Trust will provide readers with a rich range of literature on a phenomenal diversity of laws in this country, with comparative jurisprudence from Civil and Common Law countries. If the Rule of Law in a democracy is to be maintained and strengthened, we must reflect on the fact that analytical positivist scholarship is not irrelevant in our times. It is that University tradition that was nurtured in the early post-independence and post-colonial era in Sri Lanka and Civil and Common Law countries that created the foundation for the great later jurisprudence in our own courts and in India. This is especially evident in important areas of public law, including constitutional law and human rights. Justices like A. R. B. Amerasinghe and Mark Fernando and lawyers like Mr. H.L.de Silva and my late husband, R. K. W. Goonesekere, were all alumni connected to this University. Their contribution to jurisprudence and legal reform in this country was nurtured in halls of learning that recognised that we must learn the law as it is, to understand what it ought to be. Professor Peiris himself demonstrates that heritage in his later work on public law and in contributing with another distinguished alumnus, the late Neelan Tiruchelvam, to the draft Constitution of 2000. I hope that the G. L. Peiris Trust will also include papers relating to that work, the best draft Constitution to date, abandoned in what has now become the norm of adversarial politics.

The long overdue institutional connection between university academia and the Law College that is made through the G .L. Peiris Trust is welcome. The Principal of the Law College, Prasantha Lal de Alwis, PC, an alumnus of our Law Faculty, has given leadership in creating a new path that must benefit both institutions.

In my time, students and teachers did not connect outside the halls of learning in later life as Sirs/Madams in perpetuity. They became and interacted as colleagues. As a former teacher, colleague, and Vice-Chancellor of this University, thank you, GL, for this generous endowment. May it be a valued institutional legacy that will inspire commitment to, and understanding of, the Rule of Law in a country that will always be a Democracy.

Continue Reading

Features

The silent hunters: Why Sri Lanka’s spiders matter

Published

on

Genus - Plesiophrictus

By Ifham Nizam

They are everywhere, yet most of us hardly notice them. In the corner of a garden, beneath a leaf, across a paddy field, inside a forest or quietly occupying an old tree, spiders are constantly at work.

They may be tiny enough to escape the human eye or large enough to command attention, but beneath their often-misunderstood appearance lies an ecological workforce that performs one of nature’s most important jobs.

They hunt

And in doing so, spiders help keep insect populations under control, strengthen food webs and contribute to the delicate ecological balance upon which both natural ecosystems and agriculture depend.

For Sri Lanka, a country celebrated for its extraordinary biodiversity and high degree of endemism, the world of spiders is particularly fascinating. Yet it remains one of the lesser-known chapters of the island’s natural history.

Field biologist and researcher Dr. Ranil Nanayakkara has spent years helping to open that chapter.

His work on Sri Lanka’s spiders, including the spectacular tiger spiders of the genus Poecilotheria, has demonstrated that there is much more to these creatures than the fear and suspicion with which they are often regarded.

Nanayakkara has been involved in the description and documentation of several remarkable Sri Lankan tarantulas, including Poecilotheria rajaei and Poecilotheria srilankensis, as well as Chilobrachys jonitriantisvansickleae. His research has also taken him into the less-studied corners of Sri Lanka’s biodiversity.

His approach is significant because the story of Sri Lanka’s spiders is not simply a story about unusual or frightening creatures. It is a story about ecosystems.

Nature’s pest controllers

A spider sitting motionless in a web may appear inactive, but its ecological role can be anything but passive.

Spiders are predators, feeding predominantly on insects and other arthropods. Across an agricultural landscape, this makes them natural allies of farmers.

Moths, beetles, flies, grasshoppers, leafhoppers, planthoppers and many other insects become part of the prey base of different spider species.

Some spiders wait patiently in intricately constructed webs. Others actively hunt across leaves, vegetation and the soil surface. Jumping spiders stalk their prey with remarkable precision, while wolf spiders move across the ground rather than depending on webs to capture food.

Different species therefore occupy different ecological niches.

Together, they form an army of natural predators.

This is why the presence of spiders in a paddy field or vegetable plot should not automatically be interpreted as something undesirable. On the contrary, their presence may be an indication that a functioning predator community is at work.

Nanayakkara’s own publication, An Introduction to Common Spiders of Sri Lanka, was designed partly to introduce the public and research community to these frequently overlooked animals.

The book covers spider morphology, natural history and Sri Lankan spider families, while highlighting their importance as biological control agents and bioindicators.

The invisible service

There is an important ecological service taking place every day that does not appear on an agricultural balance sheet.

A spider catches an insect.

Then another.

And another.

Multiply that interaction by thousands of spiders across thousands of hectares and the ecological significance becomes enormous.

Unlike a pesticide, a spider does not need to be manufactured, transported, mixed or sprayed. It does not require a farmer to purchase another container or return to the field with a spray machine.

It simply performs its ecological role.

That does not mean spiders can replace all forms of pest management. Rather, they can form one component of integrated pest management, in which natural predators, parasites, cultural practices and carefully targeted interventions work together.

The objective should not necessarily be to create an agricultural landscape in which every insect disappears.

It should be to create one in which pest populations are kept below damaging levels through a functioning ecological system.

When pesticides kill the allies

This is where the story takes a darker turn.

Broad-spectrum insecticides are designed to kill insects, but the ecological world does not always recognise the distinction between a farmer’s target species and a beneficial predator.

When chemicals are applied indiscriminately, spiders and other predatory arthropods can also be affected.

The consequences can be surprisingly complex.

A pesticide application may reduce a crop pest rapidly. But if it simultaneously reduces the predators that feed on that pest, the field may lose part of its natural defence system.

As surviving pest populations recover, farmers may again reach for the sprayer.

The result can become a vicious circle: fewer natural predators, greater reliance on chemicals and repeated disruption of the ecological relationships that once helped regulate pest populations.

Pesticides can also move beyond the field through runoff, spray drift and other pathways, potentially affecting surrounding vegetation, wetlands and waterways.

The real cost of chemical-intensive agriculture, therefore, cannot always be measured simply by the price of a bottle of pesticide.

There can be an ecological cost that remains invisible.

A paddy field is more than a crop

Sri Lanka’s paddy fields are often viewed through the lens of production: acreage, yield, irrigation, fertiliser and harvest.

But look more closely and another world emerges.

Between the rice plants are insects. In the water are aquatic organisms. Along the bunds are grasses and other vegetation. Amphibians move through the landscape. Birds forage. Reptiles pass through.

Microorganisms work beneath the surface.

And somewhere among the vegetation, spiders wait.

The paddy field is therefore not simply a food-production unit. It is an ecosystem.

Field margins, bunds, grasses and neighbouring vegetation can provide shelter and alternative habitat for spiders and other beneficial organisms. Maintaining this ecological complexity can help predator populations persist and recolonise cultivated areas.

Poecilotheria sp.

Destroying those refuges or exposing them repeatedly to chemicals can simplify the ecosystem and weaken its natural resilience.

The spectacular world of tiger spiders

If ordinary garden spiders are largely invisible to the public, Sri Lanka’s tarantulas are impossible to ignore.

The genus Poecilotheria, commonly known as tiger spiders or ornamental tarantulas, includes some of the island’s most spectacular arachnids.

Their intricate patterns, extraordinary size and specialised lifestyles have made them subjects of scientific fascination.

Nanayakkara’s work brought international attention to this hidden world.

One of the best-known examples is Poecilotheria rajaei, a tarantula described from northern Sri Lanka after specimens were encountered during field surveys. The species was formally described in 2012 by Ranil Nanayakkara and co-authors.

The story illustrates something important about biodiversity research: discovery does not necessarily begin in a sophisticated laboratory.

Sometimes it begins in a forest.

Sometimes it begins with a local observation.

And sometimes it begins when a field researcher is willing to look closely at something that most people would rather avoid.

Another remarkable chapter came with Poecilotheria srilankensis, described from Belihuloya in 2019. The research documented another arboreal tarantula from Sri Lanka and added to understanding of the island’s highly distinctive Poecilotheria fauna.

Nanayakkara and his collaborators have also documented Chilobrachys jonitriantisvansickleae, a tarantula associated with a fragmented forest patch in Sri Lanka’s wet zone.

Poecilotheria smithi

These discoveries are not merely additions to a scientific list.

Each species raises questions.

Where does it live?

What does it eat?

How large is its population?

What habitat does it require?

How isolated are its populations?

What happens when its forest disappears?

The blue surprise in the forest

Perhaps nothing illustrates the richness of this hidden world better than the discovery of a striking blue tarantula in Sri Lanka’s rainforests.

The species, Chilobrachys jonitriantisvansickleae, was found in an isolated patch of southwestern rainforest surrounded by tea and rubber plantations. Its vivid blue colouring helped attract attention to an animal living in a highly fragmented landscape.

It is an important reminder that biodiversity does not always survive in vast wildernesses.

Sometimes it survives in small fragments.

And when a species is closely associated with a particular habitat, the destruction of even a relatively small area can have disproportionate consequences.

Beyond fear

One of Nanayakkara’s important contributions has been to make spiders accessible to people who may otherwise never look beyond their reputation.

His books, including An Introduction to Common Spiders of Sri Lanka and Poecilotheria – “Tiger Spiders” of Sri Lanka, have helped bring information about these animals to a wider audience. His Tiger Spiders of Sri Lanka focuses on the identification, habitats, behaviour and conservation of Poecilotheria.

The challenge is not simply scientific.

It is cultural.

For generations, spiders have often been associated with fear, danger and something that should immediately be killed.

But understanding changes attitudes.

Once a spider is seen as a predator rather than a pest, its role begins to look different.

Once a tarantula is understood as a specialised inhabitant of a particular forest habitat, destroying that habitat becomes a conservation issue rather than merely a matter of removing an unpleasant creature.

Small predators, enormous consequences

Spiders are also prey.

Birds, amphibians, reptiles and other animals depend on arthropods as part of their diets. Spiders consequently occupy several positions in food webs: they are predators of insects and, in turn, food for other animals.

Their disappearance can therefore create effects that travel through an ecosystem.

This is why biodiversity conservation cannot focus exclusively on elephants, leopards, birds or other charismatic wildlife.

The ecological machinery of a forest is also made up of creatures that are small, obscure and rarely photographed.

Some may never make the headlines.

But remove enough of them and the system changes.

A call to look closer

Sri Lanka still has much to learn about its spiders.

Taxonomy remains fundamental. Before conservationists can determine how a species is faring, they need to know what species exist, where they occur and how they differ from one another.

Field research is equally important because many species cannot be understood simply by examining specimens in collections.

Their habitats, behaviour, prey, reproduction and relationships with other organisms all matter.

Nanayakkara’s research illustrates the value of this patient field-based approach. His work has contributed to the documentation of Sri Lanka’s lesser-known biodiversity and to the scientific understanding of spiders that had previously received little attention.

But perhaps the larger lesson is even simpler.

Nature does not waste species.

The spider spinning a web beside a paddy field, the hunter moving through the undergrowth and the spectacular tarantula hidden in a forest tree are all pieces of a much larger ecological puzzle.

Protect the predators

Conserving spiders does not mean protecting every individual spider from every natural threat.

It means protecting the ecosystems that allow spider populations to survive.

It means reducing unnecessary pesticide use.

It means encouraging integrated pest management.

It means maintaining vegetation around agricultural fields, protecting forest fragments and conserving wetlands and streams.

It means giving farmers the knowledge to recognise that some of the creatures living among their crops are not enemies at all.

They are allies.

For Sri Lanka, there is another urgent reason to look more closely.

The island’s biodiversity is exceptional, but its habitats are increasingly fragmented and altered. The loss of specialised habitat can be particularly serious for species with narrow ecological requirements.

The work of researchers such as Dr. Ranil Nanayakkara reminds us that discovery and conservation are inseparable.

We cannot protect what we do not know.

And we cannot appreciate what we have never learned to see.

The next time a spider appears in a garden, on a paddy bund or quietly beneath a leaf, perhaps it deserves something more than a broom or a spray can.

It may be doing what nature designed it to do—hunting, regulating and maintaining balance.

For millions of years, spiders have been doing this work without asking for recognition.

Perhaps it is time we gave them some.

When we protect the predators, we protect the balance.

Continue Reading

Features

West Asian conflict undergoing manifold complications

Published

on

Captain Machchhar; heroism in the skies.

Israeli Prime Minister Benjamin Netanyahu’s message to Israel’s enemies was blunt and stark.‘We’re going to win; we have no choice.’ He said so while the majority of attendees at a recent UN General Assembly session walked out of the conference hall when the Israeli Prime Minister took the podium; many of them booing in derision.

Those commentators who have been studying Israel’s handling of her enemy states over the decades are unlikely to dismiss the entirety of Netanyahu’s address as rhetoric. The general pattern has been for the Israeli state to stand up firmly against its enemies in the battle field. On most occasions, these adversaries have been beaten back.

It is also little realized in particularly the Southern hemisphere that Israel, for the most part, could defend herself without much US assistance. The history of the conflict bears this out.

However, from the viewpoint of working towards a just and equitable peace in the Middle East the Israeli hard line stance has proved and will prove incalculably detrimental. The sworn enemies of Israel are not going to be in any way deterred by Netanyahu’s stark warnings. On the other hand, they would be only further provoked into taking on Israel by conventional or unconventional military means and seek its destruction.

The recent aborted mid-air hijacking of a Flydubai flight, consisting mainly of Israeli passengers, by an Omani extremist drives home the point. Israel’s enemies are bound to redouble their efforts to annihilate Israel rather than be deterred by the latter’s warnings about standing firm against them. This too history has proved.

It would be in the fitness of things at this juncture to pay a tribute to the professionalism, courage and humanity of the relevant airline pilot, Captain Machchhar, whose timely action proved decisive in botching the hijack attempt. His intervention averted what could very well have been another 9/11 type tragedy. History is not going to forget his daring and resourcefulness.

Meanwhile, the ground realities in West Asia are undergoing further complications that portend increasing regional instability. For example at the time of writing Turkiye, Pakistan and Saudi Arabia have agreed under the recently established ‘Mecca Alliance for Defence’ to deploy ‘deterrence measures’ collectively in the event of any member of the alliance coming under military strikes from a non-member state.

The agreement is modeled on the NATO collective defence pact and should help in defusing any threat perceptions experienced by the alliance members in the short term. However, the group would need to be cognizant of the major and potentially divisive role Iran could play in the interstate politics of the Middle East region going forward.

Iran’s reported support, for example, for Yemen’s Houthi rebels, who are engaged in attacking Saudi national assets, could at some point in time compel the alliance, under the terms of the pact, to initiate deterrent military measures against Iran.

The implications for regional peace from such a turn of events hardly require elaboration. A full blown regional war emerges as a distinct possibility if Iran sees itself as being excessively antagonized by the alliance. A further complication is that antagonistic sectarian identities of an Islamic kind could come to play hugely divisive roles in it. Shiite Islamic states would be inclined to back Iran while those countries seen as Sunni Islamic in orientation are bound to support Saudi Arabia.

Accordingly, West Asia is a region rife with manifold aggravated insecurities. If the latter are not defused dexterously they could escalate into a conflict of extra regional dimensions. The latter development would render the world a collective loser.

Unfortunately, no constructive help could be expected from the US at this juncture by way of working towards regional and international peace even of short durance. Its war against Iran has only aggravated the world’s current insecurities.

For example, the world has been compelled to face the possibility of compounded economic woes as a consequence of the Hormuz crisis remaining unresolved. The world is currently experiencing what could be seen as a ‘winter of economic discontent’ of unprecedented proportions.

Unfortunately, the international community is to all intents and purposes helpless in the face of this multifaceted crisis. Substantial intervention is expected of the UN but since it has failed to reform itself over the years it is compelled to stand idly by while the world’s insecurities heighten and multiply.

Yet, it is the seemingly paralyzed UN system that has some potential to contain the current tide of international disorder to even a small measure. Given the persisting divergent and conflicting interests among the world’s principal power blocs, the G7 and BRICS for instance, it is mainly the UN and its principal agencies that could carry some credibility as peace brokers and mediators.

However, as an initial step towards bringing the principal protagonists to the negotiating table the UN would need to convince the principal powers of the UN Security Council of the need for a substantive broad-basing of the membership of the Council so as to reflect more accurately the current global political and economic realities. Such reforms would render the Council more representative and help in strengthening its credibility and effectiveness.

The above reforms call for years of dynamism, hard work and resourcefulness on the part of the international community, read the UN. Yet the aims are not impossible to achieve if strong leadership is brought to bear by the UN.

Meanwhile, the UN agencies and allied organizations need to pay stepped-up attention to the West Asian theatre and its wasting conflicts and wars. Here too there is immense hard work to be put in.

There is, for instance, identity politics and its issues that need to be managed urgently. While internal political matters of countries could not be addressed directly by UN agencies, awareness-raising programs and projects could be energetically carried out by them to blunt the appeal of identity-based slogans, relating to, for instance, religion and race.

Besides, values at the heart of democratic politics need to be freshly and enthusiastically propagated. Vast reserves of energy and resources are needed, to be sure, to consistently champion and implement these crucial projects but they need to be pursued single-mindedly if even a dent is to be made in the current runaway global disorder.

The aborted hijacking of the Flydubai flight pointed to the dehumanizing impact of identity politics on the human consciousness. It was also an indication that those sections endowed with humanity cannot stand idly by while identity politics continues to destroy civilizational values. The time to act is ‘now’.

Continue Reading

Trending