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0引言使用化学农药防治棉花病虫害必须把握合适剂量。使用剂量过大,容易造成棉花药害;使用剂量过小,达不到防治效果。因此,使用化学药剂防治棉花(包括其它农作物)病虫害,一定要使用合适的防治剂量。
0 Introduction The use of chemical pesticides to control cotton pests and diseases must grasp the appropriate dose. The dosage is too large, easily lead to cotton injury; use dose is too small, fail to control effect. Therefore, the use of chemical agents to control pests and diseases of cotton (including other crops), must use a suitable control dose.