Cabbage cultivation: How to prevent and control downy mildew in cabbage?
How to prevent and control downy mildew in cabbage? Please give an introduction to the harm of cabbage downy mildew: Cabbage downy mildew mainly harms the leaves. At first, chlorotic spots appear on the leaves. After expanding, they become polygonal or irregular lesions due to the restriction of leaf veins. The lesions are 5-10 mm or larger, yellow or pale yellowish-brown, and slightly sunken...
How to prevent and control downy mildew in cabbage? Please give an introductionHarm of cabbage downy mildew:Cabbage downy mildew mainly harms the leaves. At first, chlorotic spots appear on the leaves. After expanding, they become polygonal or irregular lesions due to the restriction of leaf veins. The lesions are 5-10 mm or larger, yellow or pale yellowish-brown, and slightly sunken. When moist, white mold grows on the underside of the lesions. When the disease is severe, the lesions on the leaves join together, causing the leaves to dry up and die.
Control methods for cabbage downy mildew:
You can use 50% dimethomorph 1500 times dilution or 58% metalaxyl-mancozeb 800 times dilution or 64% oxadixyl-mancozeb 800 times dilution or 75% chlorothalonil 500 times dilution, spraying once every 5-7 days.
In severe cases, spray once every 3-5 days, which can effectively control the occurrence. Due to the recent increase in humidity, cabbage soft rot also occurs. During control, comprehensive control can be carried out. You can use 58% metalaxyl-mancozeb 600 times dilution + 20% bismerthiazol 800 times dilution or 50% dimethomorph 1500 times dilution + 3% zhongshengmycin 800 times dilution, spraying once every 5-7 days.
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