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1.选择品种针对不同的防治对象选用合适的农药品种。如,咬食叶片的害虫可选用胃毒作用强的药剂,像菜青虫就要选用阿维菌素等具有胃毒作用的药剂;吮吸植物汁液的害虫宜选用内吸性药剂,像蚜虫、飞虱、叶蝉要选用吡虫啉等内吸性药剂。有些农户在选用农药时比较盲目,随意性比较强,用药不对症,劳民伤财。尤其在几种农药混配使用时不同名称的同种药剂混配,不但达不到应有的防治效果,还可能造成药害,增加病虫的抗药性。2.配制农药一是计算用药量。农药标签上推荐的用药量一般是每亩用多少克或多少毫升农药,应根据施药面积和标签上推荐的使用剂量计算用药
1. Select varieties for different control objects choose the appropriate varieties of pesticides. For example, pests eating leaves can choose to use strong stomach poisoning agents, such as cabbage caterpillar should use avermectin and other drugs with gastric toxicity; sucking plant juice pests should use internal absorption agents, like aphids, fly Lice, leafhoppers to choose imidacloprid and other systemic drugs. Some farmers in the selection of pesticides more blindly random, relatively strong, medication is not symptomatic, labor-saving money. Especially in the mixed use of several pesticides with different names of the same pharmaceutical mix, not only fail to achieve the desired effect of prevention and treatment, but also may cause phytotoxicity and increase the resistance of pests and diseases. 2. Preparation of pesticides First, calculate the dosage. Recommended dosage on pesticide labels is generally how many grams or how many ml of pesticide per acre should be based on the application area and label recommended dosage calculation medication