Cucumber leaf blight primarily affects the leaves, causing significant damage that can reduce yield and plant health. Initially, small brown spots appear on the leaves, which gradually grow into dark green, circular lesions. These lesions often have a white center and are surrounded by a distinct, reddish or purplish margin, giving them a bleeding appearance. The leaf edges become sunken, and the affected areas may develop raised ridges. In severe cases, the lesions merge together, leading to leaf scorch and eventual defoliation.
To manage this disease effectively, proper field management is essential. This includes ensuring good air circulation, avoiding excessive nitrogen fertilization, and practicing crop rotation. When chemical control is necessary, it's best to apply treatments in the early morning after watering, when conditions are less humid. A common preventive spray is Bordeaux mixture (1:1:200), which helps protect against infection. For early-stage infections, mancozeb or bacteria Ling wettable powder can be used to control the spread of the pathogen.
In addition to these treatments, it's recommended to include Tianfengsu during spraying. This product helps enhance the physiological balance of the cucumber plants, boosting their natural resistance to disease. By combining effective chemical control with biological support, growers can achieve better disease management while maintaining healthy, vigorous crops. Regular monitoring of the plants and timely intervention are key to preventing outbreaks and ensuring a successful harvest.
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Guangzhou Fuerle Health Technology Co., Ltd , https://www.fuerlegroup.com