The Occurrence and Control Measures of Vegetable Rake

Also known as worms, honey worms, etc., vegetable worms are the general term for cruciferous vegetable worms. The aphids that inflict cruciferous vegetables mainly include radish sprouts, cabbage sprouts and peach pods. All three locusts belong to the family Homoptera. Mainly adults and larvae suck juice on the leaves, resulting in curling and deformation of the leaves, poor plant growth, affecting the heart, resulting in reduced yields; damage stems, pedicels and tender pods of the seed strains, resulting in distortion of the stalk deformity, can not be normal Convulsions, flowering, scabs, and pods are not full. In addition, maggots are also the vectors of cruciferous vegetable viruses, which are caused by the transmission of viruses, and sometimes they are more harmful than crickets themselves.

The main prevention measures and methods of rapeseed meal are:

1. Planting insect-resistant varieties: In the same vegetable, different varieties have different resistance to insects. Such as some hairy species, many worms do not like to eat, all parts of the country can be chosen according to circumstances.

2. Clean the pastoral areas of vegetable fields: Clearing weeds in the field several times and clearing overwintering sites, especially the weeding in the early spring and late autumn, can eliminate many insect sources. During the growing season, more seedlings with insects were removed in time to reduce the number of insect populations.

3. Protection and use of natural enemies: Many natural enemies of locusts should be protected and utilized. In the prevention and treatment with pharmaceuticals, drugs that minimize damage to natural enemies should be used. The more predatory natural enemies are six-spot ladybugs, seven-spot ladybugs, horizontal ladybugs, double-banded ladybugs, thirteen-star ladybugs, big green fly caterpillars, food gall midges, and common grasshoppers. Grasshoppers, florets, etc., parasitoids are cricket bees, and microbial predators are maggots.

4, gauze nursery cultivation: the use of gauze cultivation, can effectively block aphids in the seedling stage invasive crop seedlings and damage. In the case of vegetable seedlings, white or silver-gray gauze covering 40-45 mesh screens after seeding is used to prevent the aphids from touching the seedlings and reduce the damage caused by the vegetables. It also has obvious effects on the autumn cabbage to reduce viral diseases.

5. Elimination of Overwintering Insect Sources: In areas where overwintering spinach, crucifer seeding plants, peach trees and other aphids have passed through winter, in the spring when aphids have not yet migrated, stronger pesticides are used for prevention and control to reduce the insect source of the year. In well-produced areas in protected areas, the locusts must be eliminated in time to prevent overwintering locusts from moving into the field.

6. Appropriate early sowing: appropriate early sowing, so that the damage period after the plant grows, can reduce the damage degree of the roundworm.

7, silver gray film repellent: vegetable vines have negative tendencies to silver-gray, during the growing season of vegetables, can be hanged in the field of silver-gray plastic strips, or inserted silver gray stent, or silver gray plastic film, etc., can reduce the damage of locusts .

8, the yellow plate oil sticky: use of locusts on the yellow has a strong tropism, can be inserted in the field of some 60 to 80 cm high, 20 cm wide wood, coated with butter, to stick to kill aphids.

9. Chemical control: At present, the prevention and control of aphids is mainly chemical control. Due to the rapid reproduction rate of locusts and the rapid spread of locusts, they should be prevented and cured early in time in the prevention and control of pesticides. 50% of the commonly used drugs have been sprayed with WP or water dispersible granules 2000 to 3000 times. The drug has specific effects on the lice and does not harm natural enemies; or 10% imidacloprid WP 2000 to 3000 times, or 70% quebracho pine wettable powder 2500 times liquid and so on. Vegetable pods are resistant to methoterpene pesticides and should be used with caution or mixed with other pesticides. Commonly used 2.5% deltamethrin 2000-2500 times, or 20% fenvalerate EC 3000-4000 times; or 10% cypermethrin EC 2000-6000 times; or 20% Chrysanthemum EC 1500-2000 times liquid.

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