Biological pesticide is a kind of pesticides with holding effect, low toxicity, low residue and produce resistance slowly. Bio-pesticides varieties and their mixtures which promote using in recent years have Bacillus thuringiensis, avermectin.
Different mechanism of action of various bio-pesticides, for different crops and the prevention and control of different pests were different.
Avermectin is a new type of broad-spectrum antibiotics effective insecticide miticide, with stomach poisoning, contact action, and have intravasation role can kill leafminer pests but no ovicides effect. This insecticide is a nerve agent, through interfere with the physiological activity of the pest nerve to kill pests, different with the mechanism of action of common used insecticides, so it will not produce cross-resistance to commonly used insecticides, suitable for preventing and treating organophosphate pesticides or pests become resistant to pyrethroid insecticides. The active ingredient amount is 0.1 ~ 0.4g every 667m2, only 1/100 to 1/50 of the active ingredient of common insecticides amount every per 667m2, the pests ingest or contact the insecticide within hours will appear paralysis, poor feeding, move slowly and other poisoning symptoms, can not continue to harm the plants until death; 2 to 3 days after applied, insecticidal effect reached its peak, the persistence can up to 7 to 15 days, the prevention effect can up to 90%. In the usual dose range, it is safety to people, livestock, birds and natural enemies of pests, but for fish, shrimp, bees and other living beings have higher toxicity; the pesticide spraying to the plants surface can soon be decomposed and loss effect (except the part of leaf infiltration), spray into the soil will be adsorbed and fixed, and decomposed by microorganisms, easily degradable in water, and no cumulative effect in the living body and the environment, would not cause any pollution.
At present, China has been a number of abamectin manufacturers, registered production varieties have more than 100 kinds, including single agents, compounding agents (such as beta-cypermethrin, phoxim, dichlorvos and other mixed), original drugs and so on, its product name and active ingredient content were different, while used should pay more attention to avoid mistakes.
Before use avermectin should be noted the type of pharmaceutical and the content of the active ingredient, the spraying area, the control object and so on, strictly according to the requirements, correctly choose the desired amount of liquid sprayed in the spraying area, and accurately preparing the use concentration, in order to improve the prevention effect. The liquid can not last; suitable for spraying at dusk, the front and back of the leaves, stem and shelter should spray, do not miss spray. Many avermectin were more suitable for using in high-temperature hot summer and autumn pest control.
Suitably using pesticide, while using avermectin to control pests, pests will have 1 to 3 days poisoning process, and then death, unlike some chemical insecticides can kill the pest quickly, it should be used in the pest eggs hatched peak to the larvae; due to the long persistence, may be can appropriate to increase the number of days interval between the two times using avermectin.
Use avermectin carefully, do not use abamectin to those vegetable pests which common pesticides can completely control its hazards; for the borer pests or pests generate resistant to common pesticides can use pesticide. Can not be long-term, single-use avermectin in order to prevent pests develop resistance to it, should be used with other types of insecticide, also should not be blindly used with other pharmaceutical. The abamectin can not mix with alkaline pesticides.
Attention to safety, not to spraying in the side of the pond, river, also do not spraying in vegetable crops flowering; although the active ingredients of avermectin is lower, the dilution multiple is higher, in the process should be strictly in accordance with the pesticide safety procedures, do not sloppy.
Source:http://www.cospcn.com
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