When is a refuge not a refuge? Using temporal host use and effective mating to inform resistance management of Bt crops in northwestern China

文献类型： 外文期刊

第一作者： Lu, Zhaozhi

作者： Lu, Zhaozhi;Zalucki, Myron P.;Lu, Zhaozhi;Panpan, Wang;Xia, Deping;Zhang, Juan;Baker, Geoff;Downes, Sharon;Xie, Zongming;Parry, Hazel;Zalucki, Myron P.

作者机构：

关键词： Stable carbon isotope; Resistance management; Refuge function; Landscape; Cotton bollworm

期刊名称：JOURNAL OF PEST SCIENCE （ 影响因子：4.8； 五年影响因子：5.0 ）

ISSN： 1612-4758

年卷期： 2023 年

页码：

收录情况： SCI

摘要： There are difficulties in tracking host use by pests and mating between pests exposed to Bt selection and non-Bt hosts across landscapes. We used stable isotope analyses of sampled bulked and individual Helicoverpa armigera moths across the major cotton producing area of northwestern China to estimate contributions made by the predominant crops, Bt cotton (C-3) and non-Bt corn (C-4; a putative refuge). 'Effective mating' that between moths originating from cotton and the putative refuge (corn) was estimated using the isotope signal of sampled females and their spermatophores. Across the 4 years (2012-2015), substantially fewer moths were produced from putative refuges versus Bt cotton, and an asynchrony in population phenology occurred in moths originating from both sources at certain critical times. The proportion of C-4 moths in bulked samples, and as individual females, was the highest during spring and autumn. Furthermore, the percentage of C-4 moths originating from corn was positively correlated with its percentage in the landscape. However, mating was biased toward pairs of moths originating from the same host type. The proportion of 'effective mating' ranged from 24 to 45%, and was greatest during spring and autumn correspondingly. Our study suggests that the refuge role of corn might be overestimated in northwestern China because asynchrony of population phenology and a bias in mating toward pairs of moths that originate from host type are not being considered. Therefore, increasing the diversity of refuge crops temporally would better facilitate resistance management instead of relying on a single refuge host.

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