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Global warming may affect pesticide effectiveness

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New Delhi: The effectiveness of an important mosquito-fighting insecticide may be impaired by global warming, according to a recent study.

Two researchers from Montana State University, graduate student Shavonn Whiten and Robert Peterson, have shown that permethrin becomes less effective at killing the yellow fever mosquito (Aedes aegypti) as temperatures increase.

These mosquitoes, which are found in the tropics and the subtropics, can transmit viruses that lead to dengue, chikungunya, yellow fever, and other diseases.

“Many of the areas where these insecticides are employed have varying drastic temperature changes,” Shavonn Whiten said.

The researchers exposed adult mosquitoes to varying concentrations of permethrin at a range of temperatures.

They found an inverse relationship between death and temperature from 16 AoC to 30 AoC, which showed the highest negative correlation.

From 30 to 32, there was, however, a positive correlation between mortality and temperature. And from 32 to 34, the negative correlation resumed.

“It probably has something to do with variability and heat stress,” said Peterson.

“Once you get to those higher temperatures, there are other things going on regarding stress on the mosquito that cancel out the effect of the pyrethroids (a class of pesticides to which permethrin belongs) working better at lower temperatures and worse at higher temperatures,” he explained.

People involved in mosquito-control efforts should take temperature into account when choosing a pest control product, researchers said.

The study was published in the Journal of Medical Entomology.

(IANS)

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Many Countries Refused To Endorse Landmark Study as Climate Conference Enters Second Week

The environmental ministers arrive at COP24 and many delegates hope that they will make every effort to include the IPCC report in the conference agenda.

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Climate Change
Climate activists attend the March for Climate in a protest against global warming in Katowice, Poland, Saturday, Dec. 8, 2018, as the COP24 UN Climate Change Conference takes place in the city. VOA

As the U.N. global climate conference in Katowice, Poland entered its second week Sunday, the non-governmental environmental organization Greenpeace demanded urgent action from world leaders to tackle climate change.

Greenpeace activists projected a message onto the roof of the “Spodek” arena where the COP24 is being held, saying “No Hope Without Climate Action: and “Politicians Talk, Leaders Act.”

 

Amazon, Climate
Logs that were illegally cut from Amazon rainforest are transported on a barge on the Tapajos river, a tributary of the Amazon, near the city of Santarem, Para state. VOA

 

Disappointing many of the scientists and delegates at the conference, the United States, Russia, Saudi Arabia and Kuwait refused to endorse a landmark study on global warming which was to be the benchmark for future action in curbing the global warming.

The four nations wanted only to “note” but not “welcome” the report of the Intergovernmental Panel on Climate Change that was released in October, in keeping with the views of the Trump administration. With no consensus on including the report, the idea was dropped.

Climate Change, hurricane michael, Storms
In this photograph released by the Sri Lankan Air Force media division on May 29, 2017, flooding is seen in the country’s Matara district. VOA

U.S. President Donald Trump, who has announced he is pulling the United States out of the Paris climate agreement, tweeted Saturday that “people do not want to pay large sums of money … in order to maybe protect the environment.”

The IPCC’ report said that drastic actions would be needed to achieve the Paris accord’s most ambitious target of keeping global warming below 1.5 degrees Celsius. The report warned that the world was far from that target and heading more towards an increase of 3 degrees Celsius.

Also Read: To Help Poor Countries Adapt To Global Warming, World Bank Doubles Its Funding

On Monday, the environmental ministers arrive at COP24 and many delegates hope that they will make every effort to include the IPCC report in the conference agenda. (VOA)