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作物受害虫为害后的产量损失率要在收获前进行调查。方法是：在受害田内取五个有代表性的点，每点调查１００～２００株或５～１０个长度１ｍ的垄，然后调查被害株率，具体操作程序是：在每个样点上随机取被害株２０株（五个点共取１００株），同时在相同样点上再随机取同样数?
Crop yield loss after pest damage should be investigated before harvest. The method is as follows: Take five representative spots in the affected area, survey 100 ~ 200 or 5 ~ 10 ridges of 1m length at each point, and then investigate the victim plant rate. The specific operation procedure is as follows: randomly Take 20 strains of victims (five points total of 100), at the same time in the same sample and then randomly selected the same number?