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Prevention and control of onion blight in summer

Published: 2024-11-22 Author: mysheen

Last Updated: 2024/11/22, In the rainy season of high temperature and humidity in spring and summer, epidemic onion blight is easy to break out, resulting in wilting and even decay of onion leaves, resulting in serious losses, so it is necessary to do a good job in prevention and control. In the rainy season with high temperature and humidity in summer, it is easy to break out epidemic onion blight, which can make the originally green red onions become macular in a few days, then turn white, the onion leaves droop, and even rot, causing serious losses. Onion blight mainly harms onion leaves and pedicels. Green and white disease spots appear at the initial stage of onion leaf infection, and after enlargement, they become gray and white spots along the

In the rainy season of high temperature and humidity in spring and summer, epidemic onion blight is easy to break out, resulting in wilting and even decay of onion leaves, resulting in serious losses, so it is necessary to do a good job in prevention and control.

In the rainy season with high temperature and humidity in summer, it is easy to break out epidemic onion blight, which can make the originally green red onions become macular in a few days, then turn white, the onion leaves droop, and even rot, causing serious losses. Onion blight mainly harms onion leaves and pedicels. Green and white disease spots appeared at the initial stage of onion leaf infection, which expanded into gray-white spots, spread longitudinally along the onion leaves, and soon became long white spots, with a width exceeding half of the circumference of onion tubes, or even larger; causing onion leaves to droop and wither; during rainy periods or when humidity was high, the disease grew white cotton hairy mold; white hairs disappeared when the weather was dry, but cotton-hairy white mycelium could still be seen on the inside of onion tube leaves when torn open. The prevention and treatment of the disease should be done well in summer:

The main results are as follows: 1. High border and deep ditch cultivation, ditch drainage, timely drainage in wet and rainy days to reduce field humidity.

2. spraying foliar fertilizer at the right time, increasing phosphorus and potassium fertilizer and trace element fertilizer, avoiding partial application of nitrogen fertilizer, and applying plant ash is also beneficial to improve disease resistance.

3, according to the weather change, timely spray control, can use 25% Bunker bacteria 1000 times liquid or 25% metalaxyl manganese zinc liquid 2 times 3 times, 7 times once every 10 days, require comprehensive and thoughtful spray, wet spray through.

4. The seriously diseased plants in the field should be thoroughly removed and destroyed to prevent the spread of the disease.

Very cool article!