In recent years, the most headache for garlic farmers is the harm of garlic, especially the prevention and control of garlic blackheads. Garlic farmers even put thousands of pesticides, and their control effect is very small. The reason is that garlic farmers have insufficient understanding of garlic and prevent illegal diseases and cannot solve problems fundamentally. How should the garlic should be controlled? Let's let Huinong.com introduce you to the prevention and control methods of garlic.
First, what is garlic?
The roots are also called the mantle, the common larvae of the fly, followed by the larvae of the onion fly. The adult is a gray fly with a body length of about 6 mm. The larvae are like feces, milky white with yellowish, body length 7 to 9 mm, and 7 pairs of fleshy protrusions at the end. Larvae are generally more harmful in spring and occur in autumn. The larvae period is about 20 days, most of which lurk in the soil in April to eat garlic bulbs, causing decay, leaf color withered and wilting, and even death in severe cases.
Second, the characteristics and symptoms of garlic
Autumn is the root of the hazard. It eats garlic bulbs with larvae, causing the leaves to be yellow, the plants rot from the middle, the growth is weak, and even the dead are dead.
Garlic clams can begin to harm before winter, and wintering and wintering after winter, began to become adult in March of the following year. The adult eggs are produced in the soil around the garlic roots or under the clods and even in the sheath. The eggs can be hatched into larvae after 5-7 days, and the larvae can climb to the garlic for food. The rotten stage of garlic is the peak period of hatching of garlic.
The garlic larvae feed on the garlic bulbs with larvae, causing the bulbs to rot, and the upper leaves are yellow, wilting, and even dead. Pulling out the victim strain can be found in the cockroach, the garlic skin is yellow-brown and rot, the garlic is drilled into a hole by the larva, the incompleteness is incomplete, the garlic stalk is bare, burst, and accompanied by a foul smell. The victim is easily pulled out and pulled off.
Third, the prevention methods and measures of garlic
1. Agricultural control
Improve the quality of the land preparation, clean up the garlic, onion and stalks in the fields, land and roadsides before the preparation of the land, pour the bottom of the water, deepen the soil 30~40 cm, and cultivate the soil layer to level the land.
Use wheat bran to grow garlic, do not work with onion and garlic crops, generally with non-onion garlic crops for 3 to 4 years of rotation.
Choose fresh garlic cloves that are disease-free, harmless, and uniform in size. The organic fertilizer must be fully fermented after high-temperature fermentation, and when it is used as a base fertilizer, it is deeply buried in the soil and isolated from the garlic.
The roots are like wet and dry, and around the root of the garlic, 150 to 200 kilograms of grass ash per acre is applied, and the control effect is good. The roots of the land, if necessary, flooding once, can reduce the occurrence.
Cover the mulch. Cover the mulch film carefully, prevent the film from rupturing, the seedling hole should be small, and cover the base of the garlic seedling with loose soil.
2, physical control
Killing adults before spawning has a good control effect on roots. In the period of adult root larvae, use brown sugar water, vinegar, water to form a trapping solution in a ratio of 1:1:2.5, add sawdust and trichlorfon, mix well, put in a pot, and place the roots in the garlic.蛆 adult worms.
At the same time, combined with watering, the application of nitrogen and sulfur fertilizers that have a certain killing effect on roots can reduce the degree of damage. The application of ammonia water twice before the rotten mother's rotten stage has the effect of repelling adult roots.
3, chemical control
When sowing garlic, use 5% phoxim granules per acre for 3 to 4 kg and mix 50 kg of fine soil, and spread it in the seeding ditch. Choose a healthy and disease-free variety of garlic for seed dressing, and mix with the mix.
In the early stage of root larvae, the roots are treated with 90% trichlorfon 800-1000 times liquid, ferrous sulfate 300-400 times liquid, and 48% lescine emulsifiable oil 1000 times liquid. Take out the water-spraying piece on the sprayer nozzle, inject the liquid into the root soil, once every 10 days, and control it 2~3 times according to the occurrence of root mites.
In the prosperous period of root mites, use 1.5% dichlorfen powder 1.5~2 kg per acre, or use 40% dimethoate emulsifiable oil 1000 times solution to fill the roots, once every 7 days, continuously control 2~3 times, to 9 in the morning ~11 hours application is best. Plants should be prevented in time in the early stages of the disease so that they do not affect their growth in the future.
The above is the prevention and control method of garlic root stalks introduced by Huinong.com. For the high yield and good harvest of garlic, we must do a good job in the prevention and control of garlic root mites in time.
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