Connect with us

News

Whiteflies a growing threat to coconut and other crops in Sri Lanka

Published

on

Text and pictures by PRIYAN DE SILVA

White flies (Aleyrodidae) have become a threat to coconut and other agricultural crops in Sri Lanka. They damage plants by sucking out its juices. Heavily infested plants can be seriously weakened. Leaves often turn yellow, appear dry and drop prematurely. White flies also transmit crop viruses.

Deputy Director (Research) at the Coconut Research Institute (CRI) Lunuwila, Dr. Nayanie Aratchige says that around 1,500 species of White Fly have been reported from around the world of which four species, Aleurotrachelus atratus (Palm-infesting whitefly), Paraleyrodes minei (Citrus nesting whitefly), Aleurodicus dispersus (Spiraling whitefly) and Aleurodicus cocois (Coconut whitefly) are presently a threat to coconut palms in Sri Lanka.

Dr Aratchige said that the first mention of the White Fly plaguing coconut palms was in Barbados in 1846, and that outbreaks have been reported in the Caribbean and South American regions since the 1990s and outbreaks of Rugose spiraling whitefly (Aleurodicus rugioperculatus) in India since 2016.

The species Aleurodicus dispersus (spiraling white fly) has been present in Sri Lanka since 1990 but it was previously considered a minor pest to coconut palms.

The first major white fly outbreak in coconut plantations in Sri Lanka was reported in 2019 from the Kegalle District and it is believed to have been caused by the accidental introduction of a new species via illegal importation of seedlings, the impact of climate change, sudden drop of natural enemy populations of the native population of whiteflies due to excessive use of insecticides on other crops.

Dr. Nayanie Aratchige

Dr Aratchige said that White Flies had invaded coconut plantations in Gampaha, Kegalle, Kandy, Kalutara, Colombo, Kurunegala, Ratnapura, Puttalam and even the Galle, Matara and Hambantota Districts, which have been battling the Weligama Coconut Leaf Wilt disease for over a decade.

Banana, guava, citrus, avocado, eggplant, okra, cashew, Indian almond (Kottamba), caryota palm (Kithul palm), areca nut, ornamental plants, curry leaves, green chillie, mango, jackfruit, breadfruit, neem, pigeon pea, different varieties of pepper, Water melon, coffee, etc., host the White Fly.

The Coconut Research Institute and the Coconut Cultivation Board are conducting awareness programmes on the identification of the pest and coordinated spraying of insecticides.

Sticky traps

Dr Aratchige said that placing yellow sticky traps or spraying of the following insecticides to control the menace is recommended.

Neem oil and soap mixture

(Neem oil – 10 ml, Soap powder – 05 g dissolved in 1 L of water) or

Thiamethoxam (Actara)

(3g in 10 l of water) or Carbosulfan (Marshal 20) (20ml in 10 l of water) or Chlorantraniliprole+Thiomethoxam (Virtako 40G) (2.5g in 10 l of water)

Neem oil and soap mixture is recommended for all infested areas as this mixture is less toxic to the natural enemies of whiteflies. Artificial insecticides are particularly recommended for newly infested areas and the coconut seedling nurseries.

The CRI is further researching on methods of chemical and biological control and have sought assistance from other countries for importation of exotic natural enemies of the white fly.



Continue Reading
Advertisement
Click to comment

Leave a Reply

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

Latest News

Death toll in violent clashes at Negombo Prison rise to 25

Published

on

By

It has been reported quoting police sources that the death toll from the renewed unrest at the Negombo Prison which  this morning, has  risen from nineteen  to twenty five (25).

A clash initially broke out between two groups of inmates (a group of remand prisoners and a group of convicted inmates serving sentences) at the Negombo Prison at around 1.00 p.m. on Sunday (05).

Two inmates died in yesterday’s clash, while around 40 others sustained injuries and are  receiving treatment at hospital.

Continue Reading

News

The Government is committed to equipping children with new technology and knowledge – PM

Published

on

By

Prime Minister Dr. Harini Amarasuriya stated that the children of Sri Lanka are well capable of viewing the world with creativity and critical ways of thinking, and that the Government is committed to equipping them with the required knowledge and modern technologies necessary to realize their full potential.

The Prime Minister made these remarks while attending the opening of the ’Arumasiya’ Exhibition and the occasion of laying the foundation stone for a new three-storey building at Balangoda Vidyaloka Central College, on the 4th of July.

During the visit, the Prime Minister officially declared open the exhibition showcasing the students’ innovations and creative talents and commended them for their remarkable achievements. The Prime Minister also participated in the ceremony of laying the foundation stone for the construction of the College’s new three-storey building.

Addressing the occasion, Prime Minister Dr. Harini Amarasuriya stated:

“It is a pleasure to participate in this special event at Balangoda Vidyaloka Central College, the school where Sri Lanka’s first female Prime Minister received her education

I had the opportunity to visit the exhibition featuring the outstanding creations and innovations of the students. What I witnessed was a group of talented young people who have moved beyond textbook learning and are capable of viewing the world with creativity and critical thinking.

We are introducing a new education reform process that moves away from a rote-learning, examination-oriented system towards a practical and skills-based one. The Government is now systematically completing all the necessary preparations to implement the new education reforms scheduled to commence in 2027.

Our objective is to ensure that every child leaving school has access to vocational and technical education that matches their individual talents and meets the demands of the modern labour market. We are committed to transforming vocational education into a field that enjoys the same dignity and recognition as university education.

Finally, I commend the Principal and the academic staff of Balangoda Vidyaloka Central College for organizing this exhibition, and to the students and parents whose dedication made this event a success.”

The event was attended by Members of Parliament for Ratnapura District Wasantha Pushpa Kumara and Sunil Rajapaksha, the Mayor of Balangoda and members of the Municipal Council, the Zonal Director of Education, the Principal and academic staff of Balangoda Vidyaloka Central College, parents, and students.

Prime Minister’s Media Division

Continue Reading

News

Appointment of SPO to probe AG on hold until establishment of Ind. Public Prosecutor’s Office

Published

on

Ajith / Harshana

The appointment of a Special Parliamentary Ombudsman (SPO) to inquire into the complaints against the Attorney General, as promised in the NPP manifesto, is on hold, pending the establishment of an Independent Office of the Public Prosecutor and provincial Sub Officers.

Authoritative sources told The Island that the Justice and National Integration Ministry was awaiting the recommendations, regarding the new legislation for the establishment of such an Office, from a Committee of Technical Experts, chaired by Justice Yasantha Kodagoda, PC.

Responding to a query raised in Parliament by SJB lawmaker Ajith P. Perera about the delay in appointment of SPO, Justice and National Integration Minister Harshana Nanayakkara said the government couldn’t take a decision until the Kodagoda Committee made recommendations.

Nanayakkara said that the positioning of the SPO couldn’t be decided before they differentiate the powers of the Attorney General and the an Independent Office of the Public Prosecutor and provincial Sub Officers.

According to the NPP manifesto, provincial Sub Officers were to be established under a senior Additional Solicitor General.

Opposition sources pointed out that the relevant Cabinet decision was taken on 7 May 2025. According to the Cabinet Office, the government decided to establish an Independent Office of the Public Prosecutor and provincial Sub Officers in line with a proposal made by the United Nations High Commissioner for Human Rights, in her final report on Sri Lanka, submitted in September, 2024.

By Shamindra Ferdinando

Continue Reading

Trending