Specific medicine for purple spot disease of garlic
64% disinfectant alum wettable powder 500 times solution or 75% chlorothalonil wettable powder 500 times solution or 70% mancozeb wettable powder 500 times solution can be used for 2-3 times.
It is very important to find the symptoms of garlic purple spot in time, which is why farmers should go to the field frequently to observe. Early detection and early treatment can reduce the loss.
Prevention and control methods:
1. Rotation: rotation with non-onion crops (potato, wheat, cruciferae, etc.) for more than 2 years.
2. Select garlic seeds and medicament treatment: select disease-resistant varieties, such as purple garlic, or mix seeds before sowing, spray seeds with more than 50% carbendazim and water, dry and sow seeds to reduce the occurrence of diseases.
3. The cultivation method of high border covered with film, reasonable close planting, reducing the humidity in the field, is beneficial to the ventilation and light transmission of the plant, and can reduce the occurrence of the disease.
4. Rational fertilization: apply sufficient base fertilizer and use Guoguang Songer fertilizer and Songda bio-organic fertilizer 10-15 days before garlic sowing to improve soil fertility, improve soil physical and chemical properties, improve nutrient utilization efficiency, and inhibit the growth of soil-borne bacteria at the same time. Store nutrients for the growth of garlic. During the growing period of garlic, topdressing should be carried out reasonably according to the local fertilizer habits and plant growth, so as to promote the robust growth of plants and enhance their disease resistance.
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What medicine is used for purple spot of garlic?
At the initial stage of the disease, spray 3% polyoxygenated dehydrated agent 800x or 78% Cobo wettable powder 500x, 41.5% promethrin 1500 x, 75% chlorothalonil 500g 600x, 50% iso-carbamide 1500 times, once every 7-10 days, continuous prevention and treatment for 4 times.
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