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多年来,在植保专业统计工作中对于病虫草挽回损失产量和实际损失产量的计算,还没有一个较科学的方法。笔者经多年的试验和探索认为,利用病虫自然观察圃和防治观察田分别进行割方实际测产,或理论测产所得的平均每667 m2产量,用二者产量之差,作为每667 m2挽回损失产量的理论依据。同时,利用自然观察圃和防治观察田的病虫调查数据之差,计算出防治效果和实际损失率。
Over the years, there has not been a more scientific way to calculate the yield loss and actual yield loss of plant diseases and insect pests in the statistics of plant protection professionals. The author after years of experiments and exploration that the use of natural pest control observation and nursery observation field were cut actual measurement, or the theoretical yield of the average yield per 667 m2, with the difference between the two yield, as every 667 m2 to restore Theoretical basis for loss of production. At the same time, the control effect and the actual loss rate were calculated by using the difference between the survey data of pest and disease control in natural observation and control fields.