If you grow green onions, you can make money and lose money. In the process of planting, you want to make money with high yields. The prevention and control of pests and diseases must not be ignored. The scallions and mildews are also considered to be a common disease. Next, Xiaobian will tell you how to scientifically control the onion and downy mildew.
To know the prevention and treatment method, first understand the characteristics and laws!
1 The main hazard of the onion is the onion and onion peduncle. Once infected, yellow-white oval lesions appear on the peduncle at the beginning of the disease; white mildew is produced and then gradually changed to light or dark yellow. The diseased leaves will gradually dry down and sag, and mainly damage the middle and lower parts of the leaves. Infected pseudo stems often appear to be ruptured and bent. Infected bulbs can cause systemic infection. After the whole plant is infected, it will stop growing and even appear to grow backwards. The green onions, leaves and pedicels that are secondary infections will have yellow-white and large lesions, and the white mold layer will gradually turn green and purple. At the worst, the plants withered or even died.
2 The disease of the scallions and downy mildew is in a humid environment. Therefore, the weather with a lot of rain is obviously worsening. The temperature in the spring of March-May is suitable, and it is also suitable for the development of pathogens. Continuous cropping, poor drainage, low terrain, and poor ventilation are all factors.
The main points of prevention and control of the onion downy mildew!
1 selection of disease-resistant species: for the choice of disease-resistant species, we must carefully understand. Disease-resistant varieties are the basis for prevention and treatment. It is best to disinfect the seeds before sowing.
2 Agricultural control: Select the onion field with high terrain and convenient drainage, and implement 2-3 years of rotation with non-onion crops. In the selection of varieties, select resistant varieties, carry out seed treatment, soak seeds in 50 °C warm soup for 25 minutes, seed after harvesting; remove diseased plants and weak plants; apply base fertilizer when preparing soil, and increase phosphorus and potassium fertilizer in the later stage. Improve plant disease resistance; maintain field hygiene, clean up diseased plants, residual plants and deep tillage in time after harvest; dense planting should be reasonable.
3 medication should be timely: once the symptoms are found, then we must use the medicine in time. Use 64% evil cream manganese zinc 200g one mu of land, or 30% trifloxystrobin + unique adjuvant + brassinoin compound, according to the ratio of 10+20+10g water 30 kg stem and leaf spray; or use pyr 15-20 ml of pyraclostrobin was treated with 30 kg of water.
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