大棚内常年连作,棚内温度高,湿度大,病害发生严重,许多病虫以土壤及残枝落叶作为媒介和越冬的场所,加快了病虫的繁殖速度和侵染。因此,在大棚种植之前,为减少病虫害的发生,有必要进行大棚内及土壤的消毒。棚内消毒一般在播种或定植前2￣3天进行,每平方米用5克硫磺、少许锯末放 Perennial continuous cropping shed temperature, humidity, serious disease, many pests to the soil and residual leaves as a medium and the place for winter, speed up the propagation of pests and diseases and infection. Therefore, in the greenhouse before planting, in order to reduce the occurrence of pests and diseases, it is necessary to carry out disinfection of the greenhouse and the soil. Shed disinfection generally sowing or planting before 2 ~ 3 days, with 5 grams per square meter sulfur, a little sawdust