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【目的】昆虫自相残杀行为可以促进特定病原体的传播,这在利用昆虫病原体防治害虫方面有潜在的应用价值。本研究旨在探究棉铃虫Helicoverpa armigera幼虫自相残杀习性与其龄期及食物营养之间的相关性。【方法】分别饲喂室内品系和野外品系的棉铃虫幼虫含不同Na+浓度的人工饲料,并在饲养至3龄、4龄、5龄和6龄时,将取食相同饲料的10头幼虫为一群组移入同一培养皿中,通过测定各处理幼虫存活率,评估幼虫龄期和饲料中的Na+含量对自相残杀行为的影响。【结果】当以3龄和4龄为群组的起始龄期时,棉铃虫幼虫存活率显著低于起始龄期为5龄和6龄的群组。此外,取食正常人工饲料的幼虫存活率最高,取食缺钠饲料时,幼虫存活率明显下降。最后,幼虫群组起始龄期和食物Na+含量对幼虫化蛹率无明显影响。【结论】结果说明,棉铃虫4和5龄幼虫与3和6龄幼虫相比,自相残杀行为发生的概率更大,而Na+含量较低的食物在一定程度上促进自相残杀行为发生的可能性。本研究为在这一领域的进一步工作提供了基础。
【OBJECTIVE】 The insecticidal killing behavior of insects can promote the transmission of specific pathogens, which has potential application in the control of insect pests by using insect pathogens. The aim of the present study was to investigate the correlation between the fratricidal habit of Helicoverpa armigera larvae and their age and food nutrition. 【Method】 The larvae of Helicoverpa armigera were fed artificial diet with different Na + concentrations respectively. The larvae of 10 larvae feeding on the same feed at the 3rd, 4th, 5th and 6th instar were One group was transferred to the same Petri dish, and the larval survival rate of each treatment was measured to evaluate the effects of larval instars and dietary Na + content on the fratricidal behavior. 【Result】 The survival rates of larvae of H. armigera were significantly lower than those of the 5th instar and 6th instar larvae at the initial instar of 3 and 4 years. In addition, the larvae fed on normal artificial diet had the highest survival rate, and the survival rate of larvae decreased significantly when they fed on sodium-deficient diet. Finally, larval group initiation age and food Na + content had no significant effect on larval pupation rate. 【Conclusion】 The results showed that compared with 3rd and 6th instar larvae, 4th and 5th instar larvae of Helicoverpa armigera had a higher probability of fratricidal behavior, while foods with lower Na + content promoted the fratricidal behavior to a certain degree possibility. This study provides the basis for further work in this area.