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一、历期予测法 这种予测法是通过前一虫期发育进度,如化蛹率、羽化率、孵化率等的系统调查,当调查到其百分率达到始盛期、高峰期的标准时,分别加上当时气温下各虫期的历期,即可推算出后一虫期的发生时期。按发育进度检查结果进行发生期予测时,通常把发育进度16％、50％左右分别作为始盛期、高峰期的标准。1981年我们在一面坡林场饲养观察松毛虫化蛹及羽化进度,其结果见表1。
First, the duration of the test This method of prediction is the development of the previous stage of the worm, such as the rate of pupation, emergence rate, hatchability and other systems of investigation, when the percentage reached its peak during the peak, peak time , Respectively, plus the temperature of each period of the worm period, you can figure out the occurrence of a worm period. According to the progress of the development of test results for the expected period, usually the development of 16%, 50%, respectively, as the beginning of the peak, the peak of the standard. In 1981, we observed and observed pine caterpillars pupation and emergence progress in a slope farm, the results in Table 1.