Now, an eco-friendly solution to mosquito menace. Aravind Gopal, a 40-year-old postgraduate in Biochemistry, and P.J. Benny, Professor of Zoology at Pala St. Thomas College, have found good insecticidal properties in the extracts of as many as 20 commonly found plants in Kerala.

Talking to The Hindu , they said extracts of two commonly found weeds,Merremia vitifolia or Manja kolambivalli or grape-leaf wood rose, and Mikania scandens, also known as climbing hemp weed, have shown very good insecticidal properties, with more than 90% insect repellent property.

Mr. Aravind has set up a mini-laboratory in his residential courtyard at Puthusserry-bhagom, near Adoor, to conduct field trials.

Dr. Benny said local bodies and government agencies could use even the crude extracts of these commonly found weeds as safe mosquito reduction agents in areas affected by mosquito-borne viral diseases. A present, various official agencies are learnt to be using hazardous chemical-based insecticides in mosquito eradication drives.

U.N. findings

Mr. Aravind said a report published by the United Nations in January, 2017 had put the average human casualty due to toxic exposure of pesticides across the world at 2,00,000 a year.

Reliance on hazardous pesticides is a short-term solution and the U.N. report lists an array of serious ailments such as cancer, Alzheimer’s and Parkinson’s disease, hormone disruption, birth defects, etc., as having suspected links to pesticides.

Pesticide-poisoning exceeds even fatalities from infectious diseases in some countries, he said.

Mosquito destroyers

Mr. Aravind said backswimmers, dragonfly and its larvae, damselflies and its larvae, diving beetles, frog and tadpole, native fishes, etc., were natural enemies of mosquito. Terrestrial and aquatic plants can provide healthy air that nourishes life.

Hence a social forest-cum-pond like that of the sacred grove (sarpa-kavu) of yore can preserve the biodiversity, provide fresh air and shelter to the predators of these pests, he said.

Mr. Aravind said while controlling pests, which form less than 1% of the insects, pesticides destroy the biodiversity and environment by killing or adversely affecting various other life forms, including more than 99% of the insects which are more integral to maintenance of the ecosystem.

source: http://www.thehindu.com / The Hindu / Home> National> Kerala / by Radhakrishnan Kuttoor / June 13th, 2018