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nature : in agriculture can kill harmful insects and animals, the protection of the normal crop growth of Pharmacy. According insecticidal role can be divided into four categories : (a) stomach poison pesticides (stomach insecticide), also known as stomach poison. Food poisoning pests after death; (2) tag insecticides (contact insecticide), also known as the tag agent. Contact pests die; (3) fumigation pesticide (insecticide fumigation), also known as the fumigant. Steam pest fumigation was dying; (4) absorption of pesticides (systemic insecticide), also known as the insecticide within the derivative. Pharmacy absorbed by plants, the plants conduction, died after drinking pests. If the role of both insecticidal few species can be called integrated pesticides. Now widely used pesticides, including the three major categories : (1) of inorganic pesticides, such as arsenic calcium, sodium fluoride; (2) pesticide plant. If pyrethrin, rotenone; (3) Organic Synthesis pesticides, such as organochlorine pesticides (such as 666, DDT, etc.), organic phosphorus pesticides (such as trichlorfon, dimethoate, etc.), organic fluoride pesticides (such as fluoroacetamide, etc.), organic nitrogen pesticides (such as amine A naphthalene, etc.), organic sulfur pesticides (such as sulfur two aniline), carbamate pesticides (such as carbaryl, aldicarb), synthetic pesticides pyrethrins (deltamethrin, permethrin acrylamide).
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