Entomological Science (2015) 18, 237-244

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Hai-Yun Xu, Nian-Wan Yang and Fang-Hao Wan (2015)
Field cage evaluation of interspecific interaction of two aphelinid parasitoids and biocontrol effect on Bemisia tabaci (Hemiptera: Aleyrodidae) Middle East-Asia Minor 1
Entomological Science 18 (2), 237-244
Abstract: To explore sustainably effective biological control measures to suppress the super pest Bemisia tabaci (Gennadius) Middle East-Asia Minor 1 and better understand the biological control effects of single and multiple releases of parasitoids, we evaluated the performance and interaction of two aphelinid parasitoids of B. tabaci, Eretmocerus hayati Zolnerowich and Rose (an exotic primary parasitoid) and Encarsia sophia (Girault and Dodd) (an autoparasitoid, which is controversial in a biological control program). Single species or two species were jointly (1:1 density ratio) released in field cages on cotton in Hebei province, China, in 2010. Results of the field cage experiment showed that all parasitoid release treatments were successful in reducing the densities of the host B. tabaci relative to the control in which no parasitoid was released. The combined release of two parasitoid species showed the highest control effect among the treatments. Different population growth trajectories indicated asymmetric competitive effects of En. sophia on Er. hayati. The densities of Er. hayati were significantly higher in the Er. hayati alone treatment than in the combined release treatment, while densities of En. sophia were lower in the En. sophia alone treatment than in the combined release treatment. Our results demonstrated interspecific competition between autoparasitoid En. sophia and exotic primary parasitoid Er. hayati. However, no evidence indicated that autoparasitoid En. sophia disrupted the host suppression achieved by primary parasitoid Er. hayati. The release of the autoparasitoid together with the primary parasitoid may not influence host suppression in biological control.
(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): Fang Hao Wan

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
application technology

Pest and/or beneficial records:

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


Bemisia tabaci biotype MEAM1 Cotton (Gossypium) China (NE)
Encarsia sophia (parasitoid) Bemisia tabaci biotype MEAM1 Cotton (Gossypium) China (NE)
Eretmocerus hayati (parasitoid) Bemisia tabaci biotype MEAM1 Cotton (Gossypium) China (NE)
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