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一、掌握病虫害发生规律应定期定点进行系统调查,弄清病虫害的发生规律,及时发现防治的最佳时机。一般病害发生时只要发现病株,就应喷药防治,防止病害蔓延。而虫害则不同,在达到一定的虫口密度时才喷药防治,如蜥虫株率达30%、菜青虫二龄幼时喷药为最佳时期。二、对症下药、有的放矢如防治枯萎病,因枯萎病是土壤传播病害,防治时应在土壤中施药,如果只在地面上喷药效果不理想。防治瓜类白粉病托布津是高效药,但对霜霉病无效。
First, grasp the law of occurrence of pests and diseases Regular systematic investigation should be carried out to find out the law of occurrence of pests and diseases in time to find the best time to prevent and control. As long as the common disease found diseased plants, spraying should be prevention and control to prevent the spread of disease. Insect pests are different, before reaching a certain density of insects spraying control, such as the rate of lizards plant up to 30%, young cabbage young insects as the best period of spraying. Second, the right remedy, targeted such as wilt control, because the blight is a soil-borne disease, prevention and control should be applied in the soil, if only on the ground spraying effect is not satisfactory. Prevention melon powdery mildew Tophujin is a high-efficiency medicine, but not effective against downy mildew.