Patterns of interaction of an oligophagous insect, black-veined white Aporia crataegi L., with host plants in years with a low density of its natural population are analyzed. In years with low A. crataegi population abundance in the south of Sverdlovsk region (Sysertsky district), the species composition of caterpillar host plants gradually decreases from several woody rosaceous species of the genera Padus, Sorbus, Malus, and Crataegus to one species (Padus avium Mill.). It is shown that the mortality rate is higher for fifth-instar caterpillars developing on mountain ash than for those developing on bird cherry. Adult A. crataegi developing on bird cherry are not only larger but also grow faster than those developing on mountain ash, which may be an additional factor responsible for the observed chronographic variation during the emergence of A. crataegi generation in nature.

中文翻译：

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寄主植物对低自然种群密度下黑脉白刺槐生活力的影响

分析了在自然种群密度低的年份，一种寡食昆虫、黑脉白 Aporia crataegi L. 与寄主植物的相互作用模式。在斯维尔德洛夫斯克地区（Sysertsky 区）南部山楂树种群丰度较低的年份，毛虫寄主植物的物种组成从山梨属、山梨属、苹果属和山楂属的几种木本蔷薇科物种逐渐减少到一种（山楂属）。鸟磨坊。）。结果表明，在山灰上发育的五龄毛虫的死亡率高于在鸟樱桃上发育的毛虫。在鸟樱桃上发育的成年 A. crataegi 不仅比在山灰上发育的更大而且生长得更快，这可能是造成 A. crataegi 出现期间观察到的时间变化的另一个因素。