Laboratory bioassays of entomopathogenic fungi for control of Delia radicum (L.) larvae

Authors

Denny J. Bruck, USDA-ARS
Jane E. Snelling, Oregon State University
Amy J. Dreves, Oregon State University
Stefan T. Jaronski, USDA-ARSFollow

Date of this Version

2005

Comments

Published in Journal of Invertebrate Pathology 89 (2005) 179–183.

Abstract

Laboratory soil bioassays were performed at economic Weld rates for in-furrow (3.85 x 10⁶ spores/g dry soil) and broadcast (3.85 x 10⁵ spores/g dry soil) applications with three isolates of Metarhizium anisopliae (F52, ATCC62176, and ARSEF5520) and one isolate of Beauveria bassiana (GHA). All isolates tested were infective to second instar Delia radicum (L.). The conditionally registered M. anisopliae isolate (F52) performed best killing an average of 85 and 72% of D. radicum larvae at the high and low concentration, respectively. The mean LC50 and LC95 of F52 against second instar D. radicum was 2.7 x 10⁶ and 1.8 x 10⁸ spores/g dry soil, respectively. The use of F52 in an integrated management program is discussed.