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以农业防治为基础的水稻病虫害防治中,化学防治仍是重要措施之一。水稻病虫田间防治试验包括对病虫害发生时期、为害习性、为害程度的调查和农药大田药效试验、示范等。发生为害调查主要是为预测预报提供依据,以确定防治时间和方法,其调查方法与预测预报部分同。农药大田药效试验包括对农药品种、使用浓度、施药适期、施药次数和同一药物的不同剂型(粉剂或乳剂等)比较,及药害观察等。通过试验以确定取舍农药品种、剂型、施药量和浓度,施药适期及次
In the prevention and control of rice diseases and pests based on agricultural control, chemical control is still one of the important measures. Rice pest and field control trials include the occurrence of pests and diseases, harmful habits, the degree of harm investigation and pesticide field efficacy test, demonstration and so on. The investigation of pests mainly provides the basis for forecasting and forecasting to determine the prevention and treatment time and method, and the survey method is the same as that of forecasting and forecasting. Pesticide field efficacy trials include the pesticide varieties, the use of concentration, the appropriate application, application times and the same drug in different formulations (powder or emulsion, etc.) comparison, and observation of injury and so on. Through experiments to determine the choice of pesticide varieties, dosage forms, the amount and concentration of drug application and the appropriate time