Environmental Entomology (2012) 41, 1029-1036

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Bing Yang, Feng Ge, Fang Ouyang and Megha Parajulee (2012)
Intra-species mixture alters pest and disease severity in cotton
Environmental Entomology 41 (4), 1029-1036
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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
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Database assignments for author(s): Feng Ge, Megha N. Parajulee

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.
Aphis gossypii Cotton (Gossypium)
Bemisia tabaci Cotton (Gossypium)
Bacillus thuringiensis genes in crops (entomopathogen)