Agricultural and Forest Entomology (2014) 16, 24-32

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Bing Yang, Megha Parajulee, Fang Ouyang, Gang Wu and Feng Ge (2014)
Intraspecies mixture exerted contrasting effects on nontarget arthropods of Bacillus thuringiensis cotton in northern China
Agricultural and Forest Entomology 16 (1), 24-32
Abstract: Row-intercropping is a type of multiple cropping with two or more crops grown simultaneously in alternate rows in the same area. It is a traditional agronomic practice and is still prevalent in modern Chinese agricultural ecosystems. Many studies have proposed that intercropping at the crop species level can significantly contribute to pest management when properly managed. However, the performance of intercropping at the plant genotype level is still largely unknown.
A multiyear field experiment was conducted to examine the effects of intraspecies Bacillus thuringiensis (Bt)/non-Bt crop mixture on nontarget arthropods. Densities of dominant pests and predators were assessed via direct visual observations.
Cotton aphid population levels in monoculture Bt cotton fields were greater than that observed in non-Bt cotton, whereas the row-mixture planting of Bt and non-Bt suppressed the abundance of cotton aphids compared with that in monoculture of either genotype. Investigations also demonstrated that the intraspecies row-mixture increased whitefly abundance compared with monoculture of either genotype. However, the mixture exerted neutral effects on population sizes of mirid bugs and predators.
These results suggest that crop cultivation management is insufficient to control secondary pests of Bt cotton, and thus multiple pest suppression strategies are warranted.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Feng Ge, Megha N. Parajulee

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

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Helicoverpa armigera Cotton (Gossypium) China (NE)
Aphis gossypii Cotton (Gossypium) China (NE)
Bemisia tabaci biotype MEAM1 Cotton (Gossypium) China (NE)
Apolygus lucorum Cotton (Gossypium) China (NE)
Adelphocoris fasciaticollis Cotton (Gossypium) China (NE)
Adelphocoris suturalis Cotton (Gossypium) China (NE)
Coccinella septempunctata (predator) China (NE)
Propylea japonica (predator) China (NE)
Bacillus thuringiensis genes in crops (entomopathogen) Helicoverpa armigera Cotton (Gossypium) China (NE)
Chrysoperla nipponensis (predator) China (NE)
Orius strigicollis (predator) China (NE)