Plutella xylostella, a genus of diphtheria, belongs to the Lepidoptera Plutellae family. The host is mainly cruciferous vegetables and wild cruciferous plants, mainly cabbage, cauliflower, cabbage, radish, rape, cabbage and various vegetables. The first-instar larva only feed on the leaf, leaving the epidermis and forming a transparent spot on the leaves, known as the “open skylightâ€. The 3rd to 4th instar larvae can eat the leaves into cavities and nicks. In severe cases, the whole leaf is eaten into a net shape. . The seedling stage often concentrates on harmful leaves, eats growing points, affects the heart of the package, and damages the tender stems, larvae, and seeds on the preserved vegetables, affecting fruitfulness.
Non-pollution prevention methods
(1) Agricultural control Proper arrangement of cornices to avoid continuous cropping of cruciferous vegetables. After harvesting vegetables, remove stubble leaves of field crops and immediately plow till the summer and winter insects are eliminated, weeds in trenches and other fields are eliminated, and the number of adult crops is reduced. Egg sites and larval foodstuffs.
2. Biological control (1) Adult males are trapped with adult sex attractants at the beginning of adult overwintering period to reduce the population of offspring. (2) Select Bacillus thuringiensis (Bt) suspension 500 to 800 times, 1.8% abamectin 2000 times, and 2.5% desmomycin 1000 times to spray.
3. The chemical resistance of the old larvae of the diamondback moth is very strong. Therefore, the application of pharmaceutical control should be mastered in the hatching of eggs to the larval 2 instar. From the hatching of egg to larva 2nd instar 5% flufenoxil (carrageenan) emulsifiable concentrate; available in larvae 2 to 3 years of age, 10% chlorfenapyr (divided) suspension agent 1500 to 3000 times; also available Use 2.5% deltamethrin (dichlormic) EC 2000 to 3000 times, or 2.5% cyhalothrin (Kung Fu) EC 3000 times, or 10% cypermethrin EC 3000 to 4000 times.
The diamondback moth (Plutella xylostella L.) is a kind of pest that is currently extremely resistant to insecticides in China, so care should be taken to alternate the use of pesticides or to use compound pesticides. The use of sex attractants to attract insects is a better biological control method that can both protect natural enemies and prevent insecticides from producing drug resistance and reduce pesticide residues.
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