Currently,researchers comfirme that global warming may affect spesticide effectivenes.
In their lab study, 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 °C to 30 °C, 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 working better at lower temperatures and worse at higher temperatures.”
Lower temperatures may make the mosquito neurons more sensitive to permethrin, which is a neurotoxin.besides, the permethrin may persist longer and remain active at lower temperatures.What’smore,lower temperatures may enhance the ability of the insecticide to bind to its target site.