Cucumber vine wilt disease is a fungal disease caused by pathogens that thrive in warm and humid conditions. During hot and rainy periods, this disease is particularly prone to occur. Let's learn about the symptoms and treatment methods of cucumber vine wilt disease.
Symptoms of Cucumber Vine Wilt Disease
Cucumber vine wilt disease mainly affects the stems, vines, and leaves. When the leaves are affected, the lesions often develop along the edges of the leaves in a V-shaped or semi-circular pattern, sometimes nearly circular. The lesions are yellow-brown to brown and have many small black dots scattered on them. When the stems and vines are affected, they exhibit oval or diamond-shaped lesions that are oily, gray-white, and slightly concave. They may secrete yellowish gum-like mucus when wet, and when dry, they shrink and crack longitudinally, appearing matted with many small black dots. In severe cases, the stems and vines may rot or even die.
Treatment of Cucumber Vine Wilt Disease
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Enhance Cultivation Management: Increase greenhouse ventilation, reduce temperature and humidity, and avoid prolonged high humidity. During cucumber growth, timely leaf removal should be carried out to increase ventilation and light transmission between plants. Increase watering frequency while reducing the amount of water each time. Regularly spray protective agents such as Bacillus subtilis evenly and thoroughly, paying special attention to spraying the stems and vines of cucumbers. Regularly inspect the growth of cucumbers, and if severely affected by vine wilt disease, it is best to dig them out and bury or burn them immediately.
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Reduce Disease Incidence: Minimizing wounds is crucial as the pathogens of vine wilt disease can enter through wounds and stomata, leading to disease. Therefore, attention should be paid to reducing the presence of wounds in management. While it is inevitable to cause wounds during cucumber pruning, it is advisable to perform this operation on sunny days. When unavoidable wounds occur, protective agents should be sprayed, and foliar fertilizers containing calcium and chitosan should be applied to improve wound healing speed and resistance to pathogen invasion.
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Chemical Treatment: In the early stages of the disease, options include Bacillus subtilis, streptomycin, and zinc dimethyldithiocarbamate. In severe cases, combinations such as cyazofamid + methyl thiophanate or benalaxyl + fluazinam can be used. When symptoms occur on stems and vines, applying chemicals directly to the lesions can yield better results.
In conclusion, various factors can contribute to the occurrence of cucumber vine wilt disease. Therefore, prevention should be the primary focus, with chemical treatment as a supplement.
