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现行的三化螟测报办法,在实际应用上尚存在着一些问题:其一是,预测发蛾高峰期主要以当时调查的总活虫数所占比例最高的某令、级耒推算,只注意到各虫态的个体发育进度,而忽略了构成高峰总体虫量的比例是落在那令或那级,这样进行预测。往往误差一个令、级的历期。其二是,在计算该令幼虫或某级蛹时,常采用1/2尚需发育天数来预测,与实际发育进度误差较大。因此,应用这种办法预测准确度是不够的。
There are still some problems in the practical application of the current measurement method for the stem borer. One is that the prediction of the maximum number of the total number of live worms in the investigation at the peak of the hair moths is only made according to a certain order and level 耒, To each state of insect development of individual development, while ignoring the composition of the peak of the proportion of total insect population is in that order or level, so as to predict. Often an error, level of the period. Second, when calculating the larvae or pupae of a certain order, the number of developmental days 1/2 is often used to predict the larvae or a certain level of pupae, which is inaccurately compared with the actual developmental progress. Therefore, using this method to predict the accuracy is not enough.