There are many types of insecticides, and their effects on pests are different. According to their mode of action, they can be divided into the following categories.
(1) Stomach poison
The medicament that enters the insect body through the digestive system of the pest and causes its poison to die is mainly used to prevent and control pests that bite, gnaw, and eat by chewing mouthparts.
(2) Contact agent
It has been in contact with the skin of pests or infiltrated into the insects, causing poisoning and death, such as deltamethrin.
(3) Systemic agent
A drug that is absorbed into the plant body through the leaves, stems, and roots of the plant, transports, spreads, persists, or produces metabolites in the plant body, and causes the poison to die when the pests eat the plant tissue or sap. Mainly used to control piercing and sucking mouthparts pests.
A medicine that enters the insect body through the respiratory system of the insect in a gaseous state, causing the poison to die. It is mainly used to eliminate seedling pests and storage field pests, as well as warehouse seed pests, such as sulfuryl fluoride.
Basically, it has no toxic effect on killing insects, but it can attract insects to come, so as to concentrate the elimination of drugs, such as insect attractant, sweet and sour liquid, etc.
Pests can destroy their normal physiological functions, eliminate appetite, and die from starvation, such as antifeedant amines.
(7) Sterility agent
After the pests eat or come into contact with a certain dose, the pesticides that can make the eggs of the pests unable to hatch, such as hexaphosphamine, camptothecin, etc., have a significant sterile effect on the housefly.
(8) Insect growth regulator
Agents that disrupt the normal growth and development of insects to reduce or die, such as insect chitin synthesis inhibitor diflubenzuron.