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一、对症用药 防治某一种病害或虫害,在选择农药时,要严格区分杀虫剂、杀螨剂、杀菌剂,防治治虫药剂和治病药剂互相滥用。要根据蔬菜发生病虫的种类对症用药。 二、适时用药 防病要在某一种病害发生之前或发病初期用药。如果治虫。则要根据防治指标及各种虫害的取食方式,发生种类及时进行防治。一般虫害在点片发生时,就要进行药剂防治,防止蔓延危害。 三、隐蔽用药就是把杀虫、杀菌药剂加工成种衣剂、片剂或颗粒剂施入土壤中,利用作物根系
First, the symptomatic drug prevention and treatment of certain diseases or pests, the choice of pesticides, we must strictly distinguish insecticides, acaricides, fungicides, prevention and treatment of pest insecticides and therapeutic agents abuse each other. According to the type of pests and diseases occur symptomatic medication. Second, timely medication Disease prevention in a disease before or early onset of medication. If the worm. According to prevention and control of indicators and a variety of pests feeding, the occurrence of species in time for prevention and treatment. Pest in general when the film occurs, we must carry out chemical control, to prevent the spread of hazards. Third, the concealed medication is insecticidal, bactericidal agents processed into seed coating, tablets or granules applied to the soil, the use of crop roots