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1 April 2001 Antagonism Between Beauveria bassiana and Imidacloprid When Combined for Bemisia argentifolii (Homoptera: Aleyrodidae) Control
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Abstract

Imidacloprid and the entomopathogenic fungus Beauveria bassiana (Balsamo) Vuillemin are both used to control the whitefly Bemisia argentifolii Bellows & Perring. We tested whether the two control strategies acted additively, synergistically, or antagonistically when combined for whitefly control. We found antagonism in that B. bassiana inhibited the effectiveness of imidacloprid. When B. bassiana was combined with imidacloprid, insect response was either less than or similar to (depending on B. bassiana rates) that when imidacloprid was used alone. Adding imidacloprid to B. bassiana treatments always increased mortality, but the increase was less than additive. Beauveria bassiana spore germination and colony formation were not inhibited by imidacloprid in vitro, and B. bassiana did not adsorb or degrade imidacloprid in a tank mix. We hypothesize that B. bassiana caused a behavioral response that reduced insect feeding and uptake of imidacloprid.

R. R. James and G. W. Elzen "Antagonism Between Beauveria bassiana and Imidacloprid When Combined for Bemisia argentifolii (Homoptera: Aleyrodidae) Control," Journal of Economic Entomology 94(2), 357-361, (1 April 2001). https://doi.org/10.1603/0022-0493-94.2.357
Received: 14 June 2000; Accepted: 1 November 2000; Published: 1 April 2001
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