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Title: Susceptibility of Agrilus planipennis (Coleoptera: Buprestidae) to Beauveria bassiana and Metarhizium anisopliae

Author: Lui, Houping; Bauer, Leah S.;

Date: 2006

Source: Journal of Economic Entomology. 99(4): 1096-1103.

Publication Series: Scientific Journal (JRNL)

Description: The susceptibility of Agrilus planipennis Fairmaire (Coleoptera: Buprestidae) to selected strains of the entomopathogenic fungi Beauveria bassiana (Balsamo) Vuillemin and Metarhizium anisopliae (Metschnikoff) Sorokin was evaluated through bioassays with direct immersion or foliar exposure under laboratory conditions. Results showed that A. planipennis adults were susceptible to B. bassiana andM. anisoplae. Significant time-mortality response was found for each isolates. Isolate B. bassiana GHA killed A. planipennis adults at a faster rate compared with other isolates tested, with the lowest average time-to-death values. The LC50 values estimated under direct immersion method ranged from 1.7 x 105 to 1.9 x 107, 3.5 x 104 to 5.3 x 105, and 4.1 x 103 to 2.9 x 105 conidia/ml for B. basissiana and from 3.2 x 106 to 1.1 x 107, 4.5 x 103 to 4.5 x 105, and 1.4 x 102 to 1.2 x 105 conidia/ml for M. anisopliae at 4, 5, and 6 d after treatment, respectively. By days 5 and 6, B. bassiana GHA outperformed all other isolates tested except ARSEF 7234, followed by ARSEF 7152, 6393, and 7180. Significant concentration-mortality response was also observed for two B. bassiana GHA formulations, BotaniGard ES and Mycotrol O, and M. anisopliae F52 when insects were treated through foliar exposure. The LC50 values ranged from 114.5 to 309.6, 18.4 to 797.3, and 345.3 to 362.0 conidia/cm2 for BotaniGard, Mycotrol, and M. anisopliae F52, respectively. Based on the results of these bioassays, the efficacy of both B. bassiana GHA formulations and M. anisopliae F52 were similar against adult A. planipennis. The potential use of entomopathogenic fungi for management of A. planipennis in North America is discussed.

Keywords: Agrilus planipennis, susceptibility, entomopathogenic fungi, microbial control, bioassay

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Lui, Houping; Bauer, Leah S. 2006. Susceptibility of Agrilus planipennis (Coleoptera: Buprestidae) to Beauveria bassiana and Metarhizium anisopliae. Journal of Economic Entomology. 99(4): 1096-1103.


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