Lettuce Sclerotinia Prevention and Control

February 27, 2023

The Sclerotinia sclerotiorum mainly harms the base of the stem. The diseased part is yellowish-brown and water-stained. As the disease progresses, the whole stem part develops, causing the stem base to rot or grow up from the base of the stem to cause rotting and rotten leaves, and finally wilts and die. When the humidity in the greenhouse increases, the dense flocculent mycelium clusters form in the diseased part and turns into black murine sclerotia in the later period; the optimum temperature for the occurrence of Sclerotinia sclerotiorum is 10-20Â°C, and the relative humidity of the air is 85%. the above. Re-insertion, plant density, watering more frequently, continuous cloudy days, high incidence of high humidity, low humidity, high incidence of light when the density.
Control methods:
1. When watering, 50% carbendazim, 1000g/mu, can be used to control the incidence of the base of lettuce stems.
Second, can be used 90% carbendazim 1000 times + reported agricultural 750 times active fluid or 50% isoniazid urea 1500 times + gui 518 liquid fertilizer 750 times the liquid or 50% Fumilali 1500 times liquid + Jin Tailong chase treasure 600 times liquid, spraying once in 5-7 days, spraying once in 3-5 days when serious, spraying twice, can effectively control.
Third, 15% formicin smoke can be used, 5-7 pieces of fumigation per acre to prevent the proliferation of sclerotia.

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