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对于麦类赤霉病穗腐损失率的调查和计算,按现行方法往往与实际损失率不尽相符。笔者从1973年开始,进行多次的调查和测定,情况如下: 一.同一严重级数的病穗,其发病部位不同,损失率有明显差异。笔者测定赤霉病穗腐损失率(千粒重降低率)为:上部一级12％,下部一级31.45％,上部二级26.73％,下部二级38.98％。同是一级病穗,下部发病比上部发病的损失率高19.55％;同是二级病穗,下
For the investigation and calculation of ear rot loss of scab in wheat, the current method often does not match the actual loss rate. The author from 1973 onwards, carried out many surveys and determination, the situation is as follows: I. The same serious grade disease panicle, the incidence of different parts of the loss rate was significantly different. The authors determined that the rate of ear rot decay (rate of decrease of 1000-grain weight) was: 12% at the upper level, 31.45% at the lower level, 26.73% at the upper level and 38.98% at the lower level. The same level of disease panicle, lower incidence than the upper incidence of high loss rate of 19.55%; the same is the second disease, the next