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| 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 |
| Starvation tolerance and effects of starvation on growth, development and reproduction of the fall armyworm Spodoptera frugiperda |
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| DOI： |
| 中文关键词: 草地贪夜蛾 耐饥力 饥饿化蛹 复食 繁殖力 |
| 英文关键词:Spodoptera frugiperda starvation tolerance starvation pupation refeeding reproduction |
| 基金项目:湖南省科技厅重点研发计划项目（2020NK2034） |
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| 中文摘要: |
| 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4 d后再复食，分别统计和分析饥饿胁迫对其幼虫历期、化蛹率、蛹重、羽化率和单雌产卵量的影响。结果显示：(1)初孵至8日龄幼虫在饥饿处理过程中全部死亡，其中2~8日龄幼虫耐饥力随虫龄增大而增强，8日龄幼虫耐饥饿平均存活时间可达5.70 d；(2)10日龄幼虫在饥饿处理过程中，有68.3%的个体化蛹，幼虫历期与正常饲养的幼虫历期基本吻合，而其化蛹率、蛹重、羽化率和单雌产卵量均显著降低；(3)对8日龄幼虫饥饿不同时长胁迫后复食处理，幼虫可恢复生长繁殖，但各处理组幼虫历期延长，单雌产卵量较对照均显著降低，各处理的单雌产卵量均在300粒以上。研究结果可为该虫的扩散转移和科学防治提供一定理论依据。 |
| 英文摘要: |
| 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. |
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