Authors: Liu, Houping; Bauer, Leah S.

Source: Journal of Economic Entomology, Volume 99, Number 4, August 2006 , pp. 1096-1103(8)

Publisher: Entomological Society of America

Abstract:

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 and M. 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 × 10⁵ to 1.9 × 10⁷, 3.5 × 10⁴ to 5.3 × 10⁵, and 4.1 × 10³ to 2.9 × 10⁵ conidia/ml for B. basissiana and from 3.2 × 10⁶ to 1.1 × 10⁷, 4.5 × 10³ to 4.5 × 10⁵, and 1.4 × 10² to 1.2 × 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

Document Type: Research article

DOI: http://dx.doi.org/10.1603/0022-0493-99.4.1096

Publication date: 2006-08-01

More about this publication?

• Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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