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通过春尺蠖种群密度、幼虫体色及抗ＡｃｉＮＰＶ毒力的试验研究表明，春尺蠖种群质量的优劣，除环境因素外，还与种群的年轻衰老程度以及在时间空间的数量变动和ＡｃｉＮＰＶ的潜伏存在有密切的关系。种群密度的大小直接影响着幼虫体色和种群年龄及质量。种群密度越大，褐色幼虫占的比率越高，种群衰老，质量劣，其关系为正相关关系；种群密度越小，灰色幼虫占的比率越高，种群年轻，质量优，其关系为负相关关系。ＡｃｉＮＰＶ的发生流行极显著地依赖于宿主种群密度，种群密度越大，ＡｃｉＮＰＶ发生流行率越高，关系为正相关关系。幼虫体色与抗ＡｃｉＮＰＶ毒力的关系通过试验方差分析为深色幼虫的抗毒力极显著地低于浅色幼虫，浅色幼虫的抗毒力平均高于深色幼虫１０％～１６％。
The results of population density, larval body color and anti-AciNPV virulence showed that the population quality of P. chinensis was not only influenced by environmental factors, but also related to the population age, population change in space and the latency of AciNPV There is a close relationship. The population density directly affects the larval body color and population age and quality. The higher population density, the higher the ratio of brown larvae, the higher the population senescence and the worse the quality were. The lower the population density was, the higher the ratio of gray larvae was, the younger the population was, the better the quality was, and the relationship was negatively correlated relationship. The prevalence of AciNPV was highly dependent on the host population density. The larger the population density, the higher the prevalence of AciNPV. The relationship was positive. The relationship between body color and anti-AciNPV virulence The virulence of dark larvae by test analysis of variance was significantly lower than that of light-colored larvae. The light-colored larvae had an average virulence of 10-16% higher than that of dark larvae.