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冬春季连阴雪雨、大雾天气,棚室蔬菜由于其特殊的环境条件,病虫害发生比较严重,传统的喷雾施药易使密闭的棚室内湿度增加,可改用粉尘剂防治病害,不但省工省时而且不增加棚内湿度,药剂分散均匀,防治不留死角,效益显著。但在用药时要注意以下几点。1.喷粉前棚室的准备喷粉前把棚室的通风口和门关闭,把棚
In winter and spring, with the heavy rain, foggy weather and greenhouse vegetables, pests and diseases occur more serious due to their special environmental conditions. The traditional spray application tends to increase the humidity in a closed shed and can be replaced by a dusting agent to prevent diseases. Work time-saving and does not increase shed humidity, pharmaceutical evenly dispersed, prevention and treatment do not stay dead, the benefits significantly. However, medication should pay attention to the following points. 1. Preparation of the powder before the studio before spraying the shed vents and doors closed, the shed