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为比较桃小食心虫Carposina niponensis Walsingham越冬过程中种群耐寒性的差异,本文研究了其结茧和裸露幼虫自然种群的耐寒性,分别测定了不同时期桃小食心虫越冬幼虫过冷却点、体内含水量、总脂肪、总蛋白和总糖含量。结果表明:从10月至翌年2月份结茧和裸露越冬幼虫的过冷却点、结冰点、总蛋白含量、总糖和总脂肪含量及结茧幼虫的含水量均呈下降趋势。裸露幼虫含水量持续增加,在2月达到最高61.42%,在其存活的整个时期的含水量高于同时期结茧幼虫含水量。裸露幼虫的总糖含量持续降低,在2月份含量达到最低(0.65μg/mg),存活的整个时期显著低于同时期的结茧幼虫总糖含量。在裸露幼虫存活的整个时期总蛋白含量和总脂肪含量都和结茧幼虫没有显著差异(P>0.05)。在越冬过程中,裸露幼虫体内高含水量和低含糖量可能是其不能正常越冬的原因。
In order to compare the cold tolerance of Carposina niponensis Walsingham overwintering, this paper studied the cold tolerance of its natural cocoons and naked larvae, and measured the overcooling points, body water content, Total fat, total protein and total sugar content. The results showed that the freezing point, the freezing point, the total protein content, the total sugar content, the total fat content and the water content of cocoon larvae of cocoon and naked wintering larva decreased from October to the following February. The water content of naked larvae continued to increase, reaching a maximum of 61.42% in February, with a higher water content throughout the period of its survival than the cocoon larvae of the same period. The total sugar content of naked larvae continued to decrease, reaching the lowest content (0.65 μg / mg) in February and the total survival time was significantly lower than the total sugar content of cocoon larvae in the same period. There was no significant difference in total protein content and total fat content between cocoon larvae and cocoon larvae (P> 0.05). During the winter, the high water content and low sugar content of exposed larvae may be the reason that they can not overwinter.