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Journal of Entomology
  Year: 2009 | Volume: 6 | Issue: 2 | Page No.: 72-81
DOI: 10.3923/je.2009.72.81
 
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Combining Effect of Beauveria bassaania (Bals.) and Ertemocerus mundus Mercet (Hymenoptera: Aphelinidae) on Sweetpotato Whitefly, Bemisia tabaci Gennadius (Aleyrodidae; Hemiptera)

Mohammad A. Al-Deghairi

Abstract:
Combined effects between the entomopathogenic fungi, Beauveria bassaina (Bals.) and whitefly parasitoid, Eretmocerus mundus Mercet on Bemisia tabaci (Genn.) were investigated under laboratory conditions. The competitive interactions among them were also evaluated either alone or in combination, in respect of the positive and negative effects. The deleterious effects on the parasitoid were extremely low, particularly when the parasitized nymphs exposed to the fungus later. In direct contact bioassay, fungus caused 5.1-15.3% mortality in post-releasing trial and from 8.9-22.1% in pre-releasing trial. Three to five days after treatment, B. tabaci nymphs were rejected as a host by E. mundus females due to the fungal infection. In infected nymphs, the majority of E. mundus females were not laid and no parasitism was detected. The control efficiency of the two natural enemies of B. tabaci, when used separately or in combination, varied according to the tested biological agent. E. mundus alone reduced pest populations by 19.4 and 51.1% in pre- and post-releasing trials, respectively. B. bassaina caused 38.1% in pre-releasing trial and 29.4% in post-releasing trial. Meanwhile, the interaction between fungus and the parasitoid in combination reduced the pestpopulation by 51.2 and 72.3% in pre- and post-releasing trials, respectively.
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How to cite this article:

Mohammad A. Al-Deghairi , 2009. Combining Effect of Beauveria bassaania (Bals.) and Ertemocerus mundus Mercet (Hymenoptera: Aphelinidae) on Sweetpotato Whitefly, Bemisia tabaci Gennadius (Aleyrodidae; Hemiptera). Journal of Entomology, 6: 72-81.

DOI: 10.3923/je.2009.72.81

URL: https://scialert.net/abstract/?doi=je.2009.72.81

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