Spring and Autumn Squash Disease Prevention and Control

Powdery mildew primarily affects the leaves, causing white, round, and small patches to appear on the underside of the leaves in the early stages. These patches gradually expand and may eventually cover the entire leaf surface with a layer of white powder. In later stages, the mildew turns gray or black, especially on infected areas. To manage this disease, it is recommended to apply 15% triadimefon diluted at 1000–1500 times or 50% sulfur suspension at 250–300 times during the initial signs of infection. Spraying should be done every seven days, alternating between different fungicides for better effectiveness. Botrytis cinerea mainly targets flowers and young fruits. The pathogen often enters through damaged or fallen flowers, leading to rotting and the formation of a gray mold layer. This disease thrives in cool, humid conditions. Control measures include proper cultural practices such as using mulch, controlling irrigation, ensuring good ventilation, and promptly removing infected flowers and leaves. Fungicides like 50% sucrose WP at 1000 times, 50% chlorothalonil at 1500 times, or 50% carbendazim WP at 500 times can be alternated and applied for 6–7 days, with 3–4 applications in total. Downy mildew typically appears during the seedling stage. Infected cotyledons show yellow spots that eventually lead to wilting. On true leaves, water-soaked lesions develop into distinct yellow, polygonal spots that become brittle when dry. Under high humidity, a purple or grayish mold layer may form on the underside of the lesions. For control, mixtures such as 58% thiazole manganese zinc, 25% thiram, and 70% mancozeb in a 1:2 ratio, or 64% mancozeb at 400 times dilution, can be used. Apply these treatments every 6–7 days for 3–4 times, alternating as needed. Shrinkage disease is a physiological disorder rather than a pathogenic one. It causes successive leaves to collapse in a chicken-like manner, resulting in poor fruit set or no fruit at all, often resembling viral symptoms. The main causes are large temperature fluctuations between day and night, high humidity, and restricted water uptake at the growing point, which hinders normal leaf development. To prevent this, maintain stable temperatures and control humidity levels in the growing environment. Proper management practices can significantly reduce the risk of this condition occurring. (Word count: 510)

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Jiangxi Chengzhi Bioengineering Co., Ltd , https://www.chengzhi-bio.com