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Synonyms:insecticide, fungicide, herbicide, etc
a chemical substance or biological agent (such as viruses, bacteria, fungi, nematodes or insects) applied against any pest. Insecticides are used to control insect pests (e.g. European corn borer), fungicides to control plant diseases (e.g. potato blight), herbicides to control weedy pests (e.g. leafy spurge), etc. GE crops involve resistance to the herbicides glyphosate or glufosinate, or the presence of a natural bacterial insecticide (Bt toxin). Pesticides differ dramatically from one another in terms of specificity, toxicity, and environmental effects. The pesticides in use today differ greatly from those that predominated before the creation of the EPA in 1968. Pesticide production and application are highly regulated.