Depends on the type and some work in more than one way. For example boric acid is a stomach poison most bugs ingest when they groom, however, dusts can also clog the spiracles (holes in abdomen they...
A plant has many needs for it to grow. The most important are: Carbon, hydrogen and oxygen Nitrogen, phosphorus, potassium Sulfur, calcium, and magnesiumThe most important of these are nitrogen,...
Pesticides are designed to kill pests. If a plant is a pest (weed) a pesticide intended to control it will kill the plant.Pesticides that are designed to kill insects and beetles that damage crops...