Due to changes in the cultivation and cultivation environment, garlic root mites are common in garlic growing areas. The main diseases of garlic are scallions, pea stalks and leeks, and the flies and leeks are The larvae feed on the 1200 cm upper layer of garlic, and the larvae are sucked into the garlic cloves to form a yellow-brown hole, which further causes the garlic clove to rot, the garlic to become small, and the garlic to crack and cause economic loss. The period of larva damage is from late April to early June. The damage of garlic root hoe to garlic is generally 10%-30% or even higher. The control techniques of roots are:
I. Agricultural control
1. Improve the quality of land preparation. Before the preparation of the ground, clean up the garlic, onion and scorpion in the field, the ground, the roadside, pour the water at the bottom of the foot, combine the application of the base fertilizer, deepen the soil by 30-40 cm, and plow the soil layer, lay the seedlings and level.
2, select garlic, improve the quality of sowing. Whenever possible, use a variety of garlic and detoxified garlic varieties; choose large head garlic, remove the moldy, rotten garlic and garlic cloves, and remove the small garlic inside the garlic; the sowing depth is about 4 cm, and cover the loose soil.
3, covered with plastic film. Cover the mulch film carefully, to prevent the film from rupturing to form holes; the seedling hole should be small, and cover the seedling hole at the base of the garlic seedling with loose soil.
4. Scientific fertilization and strengthening management of fertilizer and water. Apply 3-4 kinds of fully decomposed organic fertilizer to the base fertilizer; the organic fertilizer is sprayed with 50% dichlorvos emulsifiable concentrate 800 times before being transported to Daejeon, and evenly mixed with sputum, and suffocated with soil seal for 7 days. 20 kg of fermented cake fertilizer, 30 kg of diammonium phosphate and 10 kg of urea as base fertilizer. In the later stage of growth, urea can be applied 1-2 times with irrigation, about 8 kg each time. When wintering, you should water the winter water to kill the wintering larvae and cockroaches. In the first ten days of April, combined with field irrigation, the first and second generation larvae were smothered and the water needs of garlic were satisfied to promote the robust growth of the plants.
5, garlic field should try to stay away from onions, squatting, try to completely remove the debris when harvesting garlic, reduce the amount of insects in the field.
Second, chemical control
1. Use 50% phoxim 1.5-2 kg of water and 6-7 kg of water before planting. Then mix 50 kg of fine soil and combine it with the seeding in the seeding ditch.
2. Growth and control: In the middle of April, according to the field investigation, in the initial stage of the adult, a thin layer of dry grass ash is applied to the base of the garlic to reduce spawning.
3. When the larva is found to be harmful, use 48% espresso emulsifiable concentrate 1000 times solution, or 50% phoxim emulsifiable concentrate 800 times solution, or 90% trichlorfon crystal 1000 times solution for rooting, once every 10 days. The insects are irrigated for 2-3 times. Or diluted with 48% of espresso emulsifiable concentrate 350-500 ml per acre, and evenly poured into the garlic field with water flow. It is forbidden to use high-toxic and highly toxic pesticides such as 3911 and 1605.
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