Wednesday, December 13, 2006 - 2:23 PM

Persistence of two entomogenous fungi in soil amendments for control of the pecan weevil (Coleoptera: Curculionidae)

Erika Scocco, escocco@uga.edu1, Wayne Gardner, wgardner@griffin.uga.edu1, and David Shapiro-Ilan, dshapiro@saa.ars.usda.gov2. (1) University of Georgia, Entomology, 1109 Experiment St, Griffin, GA, (2) USDA-ARS, SE Fruit and Tree Nut Research Unit, 21 DUNBAR RD, Byron, GA

Laboratory assays were conducted to determine the persistence of two entomogenous fungi, Beauveria bassiana (Balsamo) Vuillemin and Metarhizium anisopliae (Metchnikoff) Sorokin, in three common soil amendments (composted cow manure, Erthfood, and pine mulch). Persistence was quantified with periodic counts of viable colony-forming units (CFUs) on selective media and bioassays usingTenebrio molitor (L.) larvae. These measures demonstrated the activity of viable infective units in the soil amendments as opposed to non-amended orchard soil over a 28 day period. It appears that soil amendments may indeed enhance persistence of these entomogenous fungi and be candidates for alternative methods of applying the infective units to orchard soils for the management of the pecan weevil(Coleoptera: Curculionidae).

Species 1: Coleoptera Curculionidae Curculio caryae (pecan weevil)

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