Ovipositional responses of Spodoptera frugiperda on host plants provide a basis for using Bt-transgenic maize as trap crop in China

doi:10.1016/S2095-3119(20)63334-2

摘要/Abstract

摘要：

草地贪夜蛾已扩散蔓延成为非洲和亚洲的重大农业害虫，但在其美洲原生地已通过种植转基因抗虫作物实现了有效控制。我们利用室内盆栽试验和田间小区评价的方法，研究了草地贪夜蛾对转基因抗虫玉米（Bt玉米）、普通玉米以及其它多种寄主植物的产卵偏好性。室内盆栽试验结果表明，和小麦等其它作物相比，草地贪夜蛾偏好在玉米植株上产卵，且普通玉米和Bt玉米产卵量无显著差异；但当幼虫孵化取食为害后，成虫主要在Bt玉米植株上产卵。田间小区试验亦证实，草地贪夜蛾在Bt玉米和普通玉米上的产卵量相近，但显著高于小麦、高粱、谷子、花生和大豆，普通玉米的百株虫量和叶片危害等级或受害株率均显著高于其他寄主植物。此后，因Bt玉米杀死孵化的幼虫而保持极低的受害率，草地贪夜蛾主要集中在Bt玉米植株上产卵，而大幅度减少在受害较重的普通玉米上产卵。本研究表明玉米是草地贪夜蛾嗜好产卵和取食的寄主植物，Bt玉米具有诱杀草地贪夜蛾产卵而减轻其它作物受害的生态学功能。

Abstract:

Spodoptera frugiperda, the pest fall armyworm (FAW), is widespread in more than 100 countries. To date, planting insect-resistant transgenic crops is one of the main control methods in its native countries. In this study we evaluated Bt-transgenic maize (Bt maize) and non-transgenic (conventional) maize and six other host plants in greenhouse pot experiments and field trials for oviposition preference by the Chinese populations of FAW. In laboratory trials, female moths preferred to oviposit on maize with no significant preference between conventional and Bt maize. However, after conventional and transgenic maize were exposed to FAW larvae and damaged, oviposition was significantly higher on transgenic maize than on the conventional one. Field trials showed that for plants less damaged at an early stage (seedling stage), oviposition of FAW on transgenic and conventional maize was significantly higher than that on wheat, sorghum, foxtail millet, peanut and soybean while showing no significant difference between transgenic or conventional maize. FAW adults mainly laid eggs on Bt maize, while the larval density and leaf damage rating or percentage of damaged plants were significantly lower than on conventional maize. Larval density and its damage on conventional maize were significantly higher than that on Bt maize and the other five hosts. Thus, maize is a highly preferred and suitable host for S. frugiperda feeding and ovipositing, and Bt maize can be used as trap crop to protect other crops.

Key words: fall armyworm , oviposition behavior , trap crop , Bt maize

. [J]. Journal of Integrative Agriculture, 2021, 20(3): 804-814.

HE Li-mei, ZHAO Sheng-yuan, GAO Xi-wu, WU Kong-ming . Ovipositional responses of Spodoptera frugiperda on host plants provide a basis for using Bt-transgenic maize as trap crop in China[J]. Journal of Integrative Agriculture, 2021, 20(3): 804-814.

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