Negative effects of pesticide on the environment?

Pesticides are poison. Some of the better pest controls are now using baits that attract the pests and then trap them in a (harmless to humans) area or on a sticky surface. The traps then can be safely disposed of limiting the exposure of pesticides to humans.

Pesticides can kill off some of the use full insects on the plants. Like Greenfly drink the sap from the stems of cabbages, this is helping the cabbages and the farmers. So, by using pesticides you can actually be destroying insects that are not even pests!