Control method of diamondback moth
1. Rational rotation, drive down the base number of insects: implement cross-cutting of cruciferous vegetables and melons, solanaceous fruits or onions and garlic vegetables, and timely treat stubble-strained leaves after harvest to eliminate a large number of insect sources.
2. Trapping and killing adults and reducing spawning: Using the phototaxis of Plutella xylostella, black light traps were placed during the adult stage to reduce the number of eggs laid.
3. Scientific use of drugs to improve the effect of pest control: Plutella xylostella is a common pest in the cruciferous family, and it has a long history of damage. At present, there are three main types of pesticides for prevention and control:
(1) Bacterial insecticides: If Bt (Bacillus thuringiensis), the mechanism of this type of insecticide is paralysis of the nerves of the larvae of Plutella xylostella larvae, which destroy the intestinal digestive function and cause death. Dosage should not be too high or too low when administered. Insect age should not be too large. Avoid spraying at high temperatures, preferably in sunny afternoons or on cloudy days.
(2) Antibiotic Insecticides: The pesticides that are compounded with avermectin and Bacillus thuringiensis are Suavian and Sudanese species, which have strong stomach poisoning effect, both contact toxicity and high activity against Plutella xylostella.
(3) Insect growth regulators: such as 5% flufenuria EC, 5% chlorfluazuron EC, and 25% diflubenzuron suspension, etc., can inhibit the activity of pest chitin synthase and hinder the larvae after molting the new epidermis The formation of it leads to death. Pharmacy is slightly less effective, but it has a long duration. It should be used during the young period of diamondback moth and should not be used frequently. It should be applied alternately with other pesticides.
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