Plants ingest the DDT from lake water, minnows get it by eating the plants or absorbing it through their gills, bass eat the minnows and fishermen eat the bass. In this way, environmentally persistent substances such as DDT can be passed along the food chain. All pesticides are required to have directions for proper use. Most also have instructions for safe disposal and what to do in case of accidental poisoning. Still, every year 2 million people suffer from pesticide poisoning, and 40,000 die.
Some pesticides are non-hazardous or less hazardous than others.
When purchasing pesticides, look for the least toxic product that does what you want it to do. An even better solution is to use safe substitutes instead of pesticides - for example, pulling weeds instead of using herbicides. Many amphibians, reptiles, birds, bats and insects are good natural pest controls. Sprinkle in corners and around base-boards. Pour salt, red chili pepper, cream of tartar, dried mint or sage at the point of entry.