草地贪夜蛾幼虫耐饥力及饥饿对其生长发育和繁殖的影响

本文旨在明确草地贪夜蛾Spodoptera frugiperda(J.E.Smith)幼虫耐饥力及饥饿处理对其生长发育、繁殖力的影响.选取初孵幼虫(幼虫孵化1 h内)、2、4、6、8和10日龄的幼虫进行饥饿处理,测定存活率和存活时间分析其耐饥力;进一步选取8日龄幼虫分别饥饿1、2、3和4d后再复食,分别统计和分析饥饿胁...

Starvation tolerance and effects of starvation on growth, development and reproduction of the fall armyworm Spodoptera frugiperda

The aim of this study is focus on the starvation tolerance of Spodoptera frugiperda (J.E. Smith) larvae and the effect of refeeding after starvation on its development and reproduction. The initial larva (within 1 hour after hatching) , 2, 4, 6, 8 and 10-day-old larvae were selected for a starvation treatment, and the endurance with starvation was measured by the survival time. Moreover, the 8-day-old larvae were selected for a hunger treatment with 1, 2, 3 and 4 days and then refed, respectively. The larval period, pupation rate, pupation weight, emergence rate and egg-laying number per female were tracked and analyzed.The results showed that all the larvae ages of 8-day-old and below died during starvation, and the starvation tolerance of these larvae increased with the increase of the age of larvae from the 2-day-old. The average survival time of the 8-day-old larvae reached 5.70 days under the starvation conditions. However, in the course of starvation, 68.3% of the 10-day-old larvae pupated, the larval period was basically the same as that of normal rearing, and the pupation rate, pupation weight, emergence rate and single female spawning amount of these survived larvae decreased significantly. The growth and reproduction of the starved 8-day-old larvae could be resumed after refeeding, but the larva period in each treatment group was prolonged, and the number of single female oviposition was decreased compared with the control group, while the number of single female oviposition in each treatment was more than 300. The results can provide a theoretical basis for the spread and scientific control of Spodoptera frugiperda.