These are called persistent pesticides. Some persistent pesticides can build up in the bodies of animals, including man. These pesticides are called accumulative. Most persistent pesticides have very limited usage or have been removed from the market. For example, chlordane is a persistent pesticide and its use was limited to termite and fire ant control but has been removed from the market.
Pesticides become problems when they move off target.
This may mean drifting off the target if in the form of dust or mist, moving with soil particles by erosion, leaching through the soil, being carried out as residues on crops or livestock, or evaporating and moving with air currents. Safe Use Precautions Following safety precautions and using common sense can prevent harm from pesticides. Here are the minimum safety steps you should take. Before buying a pesticide, identify the pest to be controlled. Then find out which pesticide will control it.