Onion is one of the main vegetables grown in China. Many farmers choose pesticide fungicides and regulators such as carbendazim or carbaryl, gibberellin to manage onion growth. The following points are the management techniques:
1. The seedbed soil should be disinfected, so that the seedbed is in a sterile state. When the seedlings are kept, the appropriate humidity of the seedbed is maintained, and the ventilation is often performed. After the needle-forming period, every 6.35% of the fine metalaxyl, flavonoids are sprayed every 7-10 days. (For example, when it is suitable for funeral, 40% methyl chlorpyrifos and 30% carbendazim).
2. Strengthening the seedlings 7 days before transplanting, and transplanting the seedling bed with the above-mentioned fungicide plus 5500 times of the liquid brassin, which can improve the survival rate of transplanting and shorten the slow seedling period.
3. The onion field should be flat, and there should be no large clods and stagnant water. Use decomposed farmyard manure to reduce the damage of root caries.
4. From the end of May to the beginning of July, it is the peak period of pests such as thrips, fly, downy mildew and purple spot disease. It can be rooted with roots (anti-root) with 40% phoxim and 40% chlorpyrifos. In the early stage of the thrips, spray with 6% ethyl spinosyn 1500 times solution, and spray again after 7-10 days (anti-horse).
5. From the end of June to the end of July, it is the main period of occurrence of various diseases of gray mold and purple spot disease. Foliar sprays such as azoxystrobin, tetracycline and pyrimethanil are used to control the above diseases and other foliage. Disease.
More pesticide knowledge , please pay attention to China Pesticide Network
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