According to a recent production survey, cruciferous vegetables exposed to diamondback moth are seriously endangered. Plutella xylostella is also known as Plutella xylostella, moth moth, small green insects, two sharp tips, and hanging ghosts, all of which occur in Beijing. Plutella xylostella is a oligophagous pest, and it mainly injures cabbage, kale, broccoli, broccoli, indigo, cabbage, radish, rapeseed, etc. in the family Brassicaceae.
Damage symptoms
Newly hatched larvae penetrate into the leaf tissue and cause small tunnels. At the beginning of the 2nd age, it was drilled from the leaf, and leaves were fed on the back of the leaf, leaving only the leaf surface epidermis to form a transparent spot. The vegetable grower called it “open skylightâ€; the 3-4 years old leaves the leaf into a hole, and when severe, the leaf blade meshed. . Seedlings often hurt the heart, leaving the plant strain on the damage leaves, tender stems, larvae, the seeds can be eaten up, seriously affecting the yield of rapeseed.
Sex hormone trapping principle
Female adults of Plutella xylostella release the sex pheromone of the diamondback moth, and the male can find females along the sex pheromone released by the female, mating and laying eggs, and multiplying offspring. The diamondback moth sex pheromone pheromone is a bionic product based on this principle. It mimics the sex pheromone released by the adult female Plutella xylostella, and the matching trap is a male moth that captures the “intimate attendance†and reduces mating and reproduction of females. The chance to reduce the amount of offspring larvae and protect cruciferous vegetables from pests.
Instructions
In the cruciferous vegetable growing area, the adult moth sex pheromone lure and associated traps (triangle trap, ship trap) were hung in the field before the flying of the adult insects in the vegetable field. The best crop height was 15 cm. No conditions can be placed directly on the field. Place 3-5 sets per acre, placed on a checkerboard. Change the lure every other month or month and a half, change the film depending on the amount of insects and weather conditions. The use of sex hormones to trap the diamondback moth can effectively control the occurrence of adult overwintering, reduce the degree of damage, and increase the commercial value and economic value of vegetables.
Precautions
1. Because of the high sensitivity of sex pheromones, it is necessary to wash hands before installation to avoid contaminating the lure.
2. The pheromone lure should be stored in the refrigerator before use. The shelf life is 2 years. Once the bag is opened, all lures should be used as soon as possible to ensure the control effect.
3. The sex pheromone attracts adults, so the trapping should be set before adulthood; and the male adult is not attractive to the female adult.
4. It is advisable to conduct a chemical control before placing the serious insect pests in order to reduce the yield loss.
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