Lettuce in the rain after the fine white mold appeared at the root, according to local farmers reported that there is the incidence of disease at the seedling stage, ask the experts how to control?
Huang Lin, Production Technology Department, Sanshan Horticultural Field, Yulin City, Guangxi Autonomous Region A: Lettuce is infected with the soft rot of Sclerotinia sclerotiorum. There are two kinds of root rot and stem rot. After the roots are infected with Sclerotinia sclerotiorum, white hyphae are formed at the base of the stem, white particles are formed, and then the water droplets overflow, eventually turning into black sclerotia, causing the roots to rot. Infection of the stalks with S. sclerotiorum produces white hyphae in the stem and spreads continuously, causing rot in the stems and leaves, allowing the plants to soften and rot. The soft rot of lettuce Sclerotinia sclerotiorum is the source of infection by the sclerotium that has fallen off from the soil. The implementation of the paddy-upland rotation is the fundamental prerequisite for prevention and treatment of the disease. Therefore, lettuce must not be planted in succession, and it should be rotated with rice or other aquatic crops to reduce the number of sclerotia in order to reduce the occurrence and damage of S. sclerotiorum. In the early stage of disease, the leaf surface is sprayed with 1000 times 80% thiophanate-methyl solution or 800 times 1.8% octamine acetate solution, 1000 times 50% acetaminophen solution, 1000 times 50% procymidone WP, 1000 Double the 50% moldewrine solution and 500 times the 40% sclerotin aqueous solution for control. Spray once every 7-10 days. Spray 2-3 times in succession. Spray all stems and leaves evenly to start dropping drops of water. It is appropriate.
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