Types of pesticides

There are many kinds of pesticides, and their effects on pests are different. According to their mode of action, they can be divided into the following categories.

(1) stomach toxicity

Drugs that enter insects through the digestive system of pests and cause them to be poisoned and die are mainly used to prevent and control pests who bite, chew and eat through chewing mouthparts.

(2) Contact killer

A drug, such as deltamethrin, exposed to the epidermis of pests or infiltrated into insects, causing them to die of poisoning.

(3) systemic medication

Drugs that are absorbed into plants through their leaves, stems and roots, transport, disperse, retain or produce metabolites in plants, and poison pests when they feed on plant tissues or juices. It is mainly used for preventing and controlling piercing-sucking mouthparts pests.

(4) fumigant

Drugs that enter insects in gaseous state through the respiratory system of pests and cause their poisoning and death. It is mainly used to eliminate pests of seedlings, storage fields and storage seeds, such as sulfuryl fluoride.

(5) Inducer

It has basically no toxic effect on pests, but it can attract pesticides that are mainly eliminated by pests, such as insect attractants and sweet and sour solutions.

(6) antifeedant

Insecticides, such as antifeedant amine, can destroy the normal physiological function of pests, eliminate their appetite and starve them to death.

(7) Aseptic agent

Insecticides, such as hexaphosphate, camptothecin, etc., can make the eggs laid by pests unable to hatch after feeding or contacting with a certain dose, and have obvious infertility effect on houseflies.

(8) Insect growth regulator

Drugs that disturb the normal growth and development of insects and reduce their viability or death, such as diflubenzuron, an insect chitin synthesis inhibitor.