Biocontrol Science and Technology (2003) 13, 571-587

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Steven E. Naranjo, James R. Hagler and Peter C. Ellsworth (2003)
Improved conservation of natural enemies with selective management systems for Bemisia tabaci (Homoptera: Aleyrodidae) in cotton
Biocontrol Science and Technology 13 (6), 571-587
Abstract: A large-scale study was conducted in 1996 to evaluate and demonstrate strategies for pest management of Bemisia tabaci (Gennadius) in cotton involving different insecticide regimes, application methods, and action thresholds. Here we examined the effects of the various management systems on the abundance and activity of native natural enemies. Population densities of 18 out of 20 taxa of arthropod predators were significantly higher in regimes initiated with the insect growth regulators (IGRs) buprofezin (chitin inhibitor) or pyriproxyfen (juvenile hormone analog) compared with a regime dependent on a rotation of conventional, broad-spectrum insecticides. There were no differences in predator density between the two IGR regimes, and generally no effects due to application method or action threshold level. Predator to prey ratios were significantly higher in regimes utilizing the two IGRs compared with the conventional regime, but were unaffected by application method or threshold level. Rates of parasitism by Eretmocerus eremicus Rose and Zolnerowich and Encarsia meritoria Gahan were higher in the IGR regimes compared with the conventional regime, but were unaffected by insecticide application method, or the action threshold used to initiate applications of the IGRs. Results demonstrate the selective action of these two IGRs and suggest that their use may enhance opportunities for conservation biological control in cotton systems affected by B. tabaci, especially relative to conventional insecticide alternatives.
(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): Steven E. Naranjo, Peter C. Ellsworth, James R. Hagler

Research topic(s) for pests/diseases/weeds:
health/environmental effects of pesticides
control - general
Research topic(s) for beneficials or antagonists:
resistance to pesticides


Pest and/or beneficial records:

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


Bemisia tabaci Cotton (Gossypium)
Eretmocerus eremicus (parasitoid) Bemisia tabaci Cotton (Gossypium)
Encarsia meritoria (parasitoid) Bemisia tabaci