What are the control methods for gray mold in Welsh onion?
How do you control gray mold in Welsh onion? Please give an introduction. Gray mold in Welsh onion, also known as white spot disease, is a major disease of Welsh onion. It mainly damages the leaves. In the early stage, white oval or nearly round spots appear on the leaves, mostly spreading downward from the leaf tip, gradually joining together into patches, causing the leaf tip to curl and die. When humidity is high, a large...
How do you control gray mold in Welsh onion? Please give an introduction
Gray mold in Welsh onion, also known as white spot disease, is a major disease of Welsh onion. It mainly damages the leaves. In the early stage, white oval or nearly round spots appear on the leaves, mostly spreading downward from the leaf tip, gradually joining together into patches, causing the leaf tip to curl and die. When humidity is high, a large amount of gray mold layer appears on the dead leaves.
Control measures: (1) Agricultural control. Select disease-resistant varieties, apply more organic fertilizer, reasonably increase phosphate and potassium fertilizer, and strengthen field management. When soil moisture is high, cultivate in time to aerate the soil and reduce humidity, ensuring robust growth of Welsh onion. (2) Chemical control. Alternately spray 50% carbendazim or 70% thiophanate-methyl wettable powder at 800-1000 times dilution.
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