How to prevent and control late blight in kiwifruit during hot and humid weather?
How to prevent and control late blight in kiwifruit during hot and humid weather? Please explain the methods. Kiwifruit late blight is a fungal disease. It rarely occurs during the seedling and mature plant stages of kiwifruit, mainly affecting kiwifruit leaves and fruit, with fruit generally suffering more severe damage. Infected leaves form dark green water-soaked lesions with indistinct edges, which turn brown after expanding...
How to prevent and control late blight in kiwifruit during hot and humid weather? Please explain the methods
Kiwifruit late blight is a fungal disease. It rarely occurs during the seedling and mature plant stages of kiwifruit, mainly affecting kiwifruit leaves and fruit, with fruit generally suffering more severe damage. Infected leaves form dark green water-soaked lesions with indistinct edges, which turn brown after expanding, similar to brown spot disease. When humidity is high, white mold appears at the junction of the lesion on the underside of the leaf; when dry, the diseased area withers, becoming brittle and easily broken. Low temperature and dampness are the main conditions for the occurrence of this disease. It tends to become epidemic when the temperature is 18°C-22°C and the relative humidity is 95%-100%. Mycelial growth is fastest at 20°C-23°C. It spreads through airflow and rain. Excessive application of nitrogen fertilizer, insufficient base fertilizer, continuous rainy days, insufficient light, poor ventilation, overwatering, and excessive density make plants prone to the disease. It is an epidemic disease with multiple repeated infections.
For late blight, a combination of agricultural control and chemical control can be used. Select disease-resistant varieties, pay attention to ventilation, use soil testing and formulated fertilization, plant at a reasonable density, and promptly prune and remove central diseased plants and diseased leaves. Applying chemicals promptly after discovering central diseased plants gives good results. Chemicals include: 30% tebuconazole 3000-fold solution, polyoxin, 50% downy mildew and late blight special net 800-fold solution, or 25% metalaxyl 800-fold solution by spray. 50% metalaxyl-copper 600-fold solution can also be used for root drenching.
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