Why do pesticides create the greatest problems for carnivores?
They can poison and harm the carnivore. When it eats the prey it also eats the pesticides which could kill it.
Because the carnivore's prey is affected by pesticides for whatever reason (ex. the prey could have been near a recent pesticide spray, or the prey could have been near a mosquito that had been carrying a pesticide microbe) then the predator/carnivore/ consumer of the prey could then be negatively affected by the microbes the prey was carrying.
Reduced control of the target
Injury of non-target plants and animals
Environmental damage.
May disrupt the natural balance in ecosystems