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Abstract
The effects of
Beauveria bassiana strain GHA, applied as BotaniGard ES, on newly colonised and well-established populations of emerald ash borer,
Agrilus planipennis (Coleoptera: Buprestidae) were evaluated in the field using foliar and trunk sprays in Michigan in 2004-2005. Results from field trials at a newly colonised white ash site showed a 41% reduction in
A. planipennis population in fungal-treated trees compared with that of untreated controls. In addition, fungal infection was also found in 20% of the larval population within 14 days of incubation under laboratory conditions. At a site with a well-established
A. planipennis population in green ash trees, larval density was reduced by 47% for trees treated with the fungus compared with that of the controls; 21% of larvae from the current generation were found infected after 14 days of laboratory incubation. Fungal-treated green ash trees also produced fewer adults emerging in the next generation, with a 63% reduction in adult density observed in treated trees compared to that of controls. As a result, fungal-treated trees sustained 42% less crown dieback than did controls.
Agrilus planipennis larval density was negatively correlated with trunk height above the ground, and positively correlated with log diameter.
Citation
Liu, Houping; Bauer, Leah S. 2008. Microbial control of
Agrilus planipennis (Coleoptera: Buprestidae) with
Beauveria bassiana strain GHA: field applications. Biocontrol Science and Technology. 18(6): 571-585.
