0 a chemical used for killing insects and small animals that damage crops:
organophosphate pesticides/poisoning
This suggests that additional organophosphate products were used by farmers at times of high insecticide use.
With all the organophosphates tested, except fenthion, the decline in resistance was significant.
A higher frequency of individuals resistant to chlorpyrifos, disulfoton and ethion was associated with greater use of insecticides, especially other organophosphates.
The organophosphate diazinon was the most commonly used active ingredient to control ectoparasites on sheep.
However, since the previous survey in 1997, the number of farms overall using organophosphates have reduced.
Lure-baited traps incorporate a contact insecticide (usually 1 ml of the organophosphate malathion).
Farmers who relied heavily on insecticides tended to prefer to use organophosphates.
The effects of number of insecticide applications per year and number of organophosphate applications per year are the same for all three insecticides.
