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通过５年的日本松干蚧发生期系统观测资料，运用数理统计方法，计算出日本松干蚧同一虫态和不同虫态的理论期距值和平均数标准差。结合生产防治，建立了固定若虫期一元回归预测式。方法简便，可操作性强
Based on the systematic observation data of 5 years of Japanese pine and gecko occurrence period, the theoretical period value and average standard deviation of the same insect state and different insect states of Japanese pine scale were calculated by mathematical statistics method. Combined with the production control, the establishment of a fixed nymph period of one dollar regression formula. The method is simple and practical