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The leeks are known as leeks, green onions and garlic. The most serious damage is caused by amaranth. The larvae clustered the underground bulbs and tender stems of the leek, causing the bulbs to rot, and the leaves were dead and yellow. Lightly, the lack of plants and ridges, and the destruction of the seeds. The larvae are wet and dry, and the wet soil, the juicy stems and bulbs are seriously damaged.
Prevention and treatment method of leek root
1. Agricultural control:
Winter irrigation or spring irrigation can eliminate some larvae, such as liquid medicine (ammonia water 8-10 kg / mu). After drying and drying the roots for 5-6 days, apply 50% malathion powder or 1.5% dimethoate powder (2 kg/mu) before spraying the soil or spray the fine soil with the emulsion to make toxic soil.
2. Chemical control:
In the adult emergence period, use 10% chrysanthemum emulsifiable concentrate 3000 times. Or 2.5% deltamethrin 3000 times solution, or 20% fenvalerate 3000 times solution, or 50% phoxim emulsifiable concentrate 1000 times solution, preferably sprayed at 9-10 am. In the field, when the tip of the leaf turns yellow and softens and gradually falls to the ground, it is treated with 2000% wave of 20% chloran emulsifiable concentrate, or 5000 times of 5,000 times of enemy killing emulsifiable concentrate, or 2000-3000 times of 50% phoxim emulsifiable concentrate. Root irrigation prevention.
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