Symptoms of Lettuce Sclerotinia: brown spots develop on stems and leaves, and under conditions of high humidity, as the disease progresses, a large number of white cotton flocculent mycelia grow on the surface of the diseased part. Black sclerotia. The optimum temperature for the occurrence of Sclerotinia sclerotiorum is about 20°C, and the relative humidity of the air is 85% or more.
Prevention: 1 removal of diseased plants in the shed to prevent the re-infection of pathogenic bacteria. 2 Strengthen humidity and reduce air humidity. 3 chemical control. Commonly used agents are quick-acting, sclerotin, net, multi-mildew, polysulfide suspension; in order to prevent the increase of air humidity, it is best to use dust or aerosols, such as 100 rot, fast Keling smoke agent.
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