What Are The Pesticides Divided Into By Their Means Of Action?

1. Stomach poison. Through the insect mouth into its digestive system to play a poisonous killing effect, such as trichlorfon.

2. Contact agents. After contact with the epidermis or appendage, it penetrates into the worm body, or corrodes the waxy layer of the worm body, or blocks the valve to kill pests, such as pyrethroids, mineral oil emulsions, and the like.

3. Fumigants. The use of volatilization of toxic gases, liquids or solids to cause steam poisoning of pests or pathogens, such as methyl bromide.

4. Systemic insecticide. It is absorbed and transported to the whole plant by the seeds, roots, stems and leaves of the plant. Within a certain period of time, the original body or its activated metabolites feed on the plant tissue or suck the plant juice with the pests, and enter the worm body to kill and kill. Such as dimethoate and so on.