Best insecticidal pesticides for cabbage: biological insecticides, pyrethroid insecticides, phenylcarbamoylurea insecticides.

1, biological insecticides

Biological insecticides derived from pest pathogenic microorganisms, food safety and production of agricultural products and friendly to the environment, is all the control of cabbage cabbage greenfly agents inside the pesticide type should be preferred, especially for the production of cabbage, in the prevention and treatment of cabbage greenfly should be the main pesticide of this type. The pesticides should be mainly used in the control of cabbage greenfly. This type of pesticide in the process of the efficacy of the general host to go through the process of infestation, expansion of reproduction, gastric poisoning kill process.

Biological insecticides for the control of cabbage greenfly include abamectin emulsion, Bacillus thuringiensis liquid, Bt wettable powder and so on, and the concentration of the use of the product can be referred to the instructions of the package for dilution.

The most efficient application period for this type of pesticide is during the egg hatching period, after the agent is sprayed onto the eggs, the hatching larvae are easily infected to death, and the killing effect is better. The adult stage can also be killed by gastric poisoning after the cabbage greenfly chews the leaves with biocides. These drugs can not be mixed with alkaline pesticides, fungicides, spraying time to avoid high temperature and strong light weather.

2, pyrethroid insecticides

Pyrethroid pesticides are characterized by fast killing of pests, high efficiency and relatively low pesticide residues after the application of pesticides, this type of pesticide is the principle of action is to interfere with the pest's nervous system to play a role in the killing, but the disadvantage is that the continuous application of the insect will make the increase in the resistance of the vegetable pests, which gradually increase the difficulty of control. The pesticide is a good way to prevent and control the disease.

There are many types of pyrethroid pesticides, including cypermethrin, cyfluthrin and cypermethrin, etc., and the dilution concentration for application should be referred to the instructions on the package. Special attention should be paid to the fact that the maximum number of applications of this type of pesticide should not exceed three times per season, and it is best to alternate with other types of insecticides, and this type of drug is toxic to bees, fish, etc., so be careful about the safety of the storage process.

3, phenylcarbamoylurea insecticide

This is a new class of insecticides, in the cabbage and other agricultural products, as well as soil, water and so on inside the easy degradation of the pesticide residue is low, almost no pollution of the environment. Phenylcarbamide pesticides can inhibit the synthesis of chitin in the eggs and larvae through gastric toxicity, and play a role in killing them, but not in adult insects, but it can cause sterility of adult insects to reduce the reproduction of pests.

This type of pesticide for the control of cabbage greenfly includes chlorothalonil 3, flufenoxuron, flufenuron, diflubenzuron, and suzukuron, etc., and the specific dilution concentration should be referred to the instructions of the product package. These pesticides can be used in conjunction with pyrethroid pesticides, which are slightly toxic to fish and shrimp, non-toxic to bees, but highly toxic to silkworms, and should be avoided in the spraying of silkworm breeding areas and mulberry trees where silkworms feed.