Intra-Species Mixture Alters Pest and Disease Severity in Cotton
Intra-Species Mixture Alters Pest and Disease Severity in Cotton
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DOI：
10.1603/en11182
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发表时间：
2012-08
期刊：
影响因子：
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通讯作者：
Bing Yang;F. Ge;Fang Ouyang;M. Parajulee
中科院分区：
文献类型：
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作者：
Bing Yang;F. Ge;Fang Ouyang;M. Parajulee
摘要广泛种植表达苏云金芽孢杆菌(Bt)毒素的转基因作物用于害虫控制可能会潜在地影响非靶标害虫和土传疾病。在这项研究中，进行了一项田间试验，以探索生境多样化，特别是遗传差异的棉花品系的种内混合，对非目标害虫和土传疾病的影响。据推测，这种混合物将抑制疾病的严重性，并将改变害虫和捕食者的数量。结果表明，75%抗虫棉与25%抗病棉成排混配，对枯萎病有抑制作用，对棉蚜有较好的防治效果。然而，在基因水平上间作增加了棉铃虫和甘薯粉虱的密度。此外，混合物对捕食者丰度的影响从中性到正值不等，并且在物种和年份之间存在很大差异。对作物混合物的特定物种的害虫反应为未来最佳大小和配置的避难所建设提供了新的见解。
ABSTRACT Widespread planting of crops genetically modified to express Bacillus thuringiensis (Bt) toxins for pest control may potentially affect nontarget pests and soil-borne disease. In this study, a field trial was conducted to explore the effects of habitat diversification, specifically an intraspecies mixture of genetically distinct cotton lines, on nontarget pests and soil-borne disease. It was hypothesized that the mixture would suppress disease severity and would alter pest and predator abundances. Results confirmed that a row-mixture of 75% insect-resistant cotton and 25% disease-resistant cotton suppressed Fusarium wilt and controlled cotton aphids. However, intercropping at the genotypic level increased mirid bug and sweetpotato whitefly densities in cotton. Moreover, the effect of the mixture on predator abundance ranged from neutral to positive and was highly variable among species and years. Species-specific pest responses to the crop mixture provide new insights for optimally sized and configured refuge construction in the future.