Because the diamondback moth has many generations, high reproductive rate, overlapping generations, and extremely strong resistance to drugs, many pesticides have poor control effect against Plutella xylostella, which makes the vegetable farmers have a headache. In order to effectively prevent and control the diamondback moth, the author hereby recommends to the vegetable farmers that the following three methods must be controlled;
1. Rational rotation, drive down the base number of insects to implement cruciferous vegetables and melons, solanaceous fruit or onion and garlic vegetables rotation, after harvest, timely treatment of stubble leaves, to eliminate a large number of insect sources.
2. Trapping and killing adult worms reduce the phototaxis of the diamondback moth, and black light traps are placed during adult emergence to reduce the number of eggs laid.
3. Scientific use of drugs to improve the pest control effect 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: Plutella xylostella is a lepidopteran pest that uses a bacterial insecticide and has a good control effect. Such as Bt (Bacillus thuringiensis), the mechanism of this type of insecticide is to paralyze the nerves of the larvae of Plutella xylostella and destroy the digestive function of the intestine. Lethal doses of 50 to 100 grams per mu are used to spray 50 kilograms of water. Dosage should not be too high or too low when applied; worm age should not be too large, to avoid spraying at high temperatures, preferably in the sunny afternoon or cloudy days, but less than 15 °C should not be applied.
(2) Antibiotic Insecticides: The pesticides that are compounded with avermectin and Bacillus thuringiensis include Suavian and Sudan species, which have strong stomach toxicity, both contact toxicity and high activity against Plutella xylostella. Drug efficacy lasted 10 to 15 days.
(3) Insect growth regulators: These agents include 5% flufenoxil (Cadcor) EC, 5% chlorfluazuron (CPT) EC, and 25% diflubenzuron (No. 3) SC, etc. Suppresses the activity of pest chitin synthase and hinders the formation of new epidermis after larval molting, leading to death. The agent is slightly less effective, but it has a long duration. It should be used in the young stage of diamondback moth, and it should be applied only once or three times per year. It can not be used frequently and should be applied alternately with other pesticides.
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