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Entomopathogens in conjunction with imidacloprid could be used to manage wireworms (Coleoptera: Elateridae) on spring wheat

Published online by Cambridge University Press:  12 December 2017

Frank B. Antwi
Affiliation:
Department of Research Centers, Western Triangle Agricultural Research Center, Montana State University, P.O. Box 656, 9546 Old Shelby Road, Conrad, Montana, 59425, United States of America
Govinda Shrestha
Affiliation:
Department of Research Centers, Western Triangle Agricultural Research Center, Montana State University, P.O. Box 656, 9546 Old Shelby Road, Conrad, Montana, 59425, United States of America
Gadi V.P. Reddy*
Affiliation:
Department of Research Centers, Western Triangle Agricultural Research Center, Montana State University, P.O. Box 656, 9546 Old Shelby Road, Conrad, Montana, 59425, United States of America
Stefan T. Jaronski
Affiliation:
United States Department of Agriculture, Agricultural Research Service, Northern Plains Agricultural Research Laboratory, 1500 North Central Avenue, Sidney, Montana, 59270, United States of America
*
1Corresponding author (e-mail: reddy@montana.edu)

Abstract

We examined the effect of biopesticides used alone, mixed with other biopesticides, or in conjunction with an imidacloprid against wireworms (Coleoptera: Elateridae) in spring wheat Triticum aestivum Linnaeus (Poaceae) (variety: Duclair). The study was conducted at Ledger and Valier, Montana, United States of America in 2015 and 2016. Ten biopesticides (spinosad, azadirachtin, pyrethrin, Beauveria bassiana (Balsamo-Crivelli) Vuillemin (Fungi: Clavicipitaceae) GHA (Mycotrol), B. bassiana ANT-03 (BioCeres), Chromobacterium subtsugae Martin et al. (Bacteria: Neisseriaceae), Burkholderia Yabuuchi et al. (Burkholderiaceae) species, Metarhizium brunneum Petch (Fungi: Clavicipitaceae) ESC1 (MbESC1), and M. brunneum F52 (MetF52) as microsclerotial and corn grit-based granules) were tested in addition to thimet and imidacloprid. Treatment efficacy was based on plant stand protection, wireworm populations, and yield. In 2015, there was considerable variation between sites in treatment efficacy. Mycotrol, BioCeres, MetF52+spinosad, and MetF52+imidacloprid applications protected seedlings from wireworm damage better than the control at Ledger, while only MetF52 at Valier. Wireworm populations were significantly higher with Mycotrol, spinosad, MetF52+spinosad, MbESC1 (25 g/L), and MetF52 treatments, compared with control, at 14 and 28 days post application at Ledger, but without effect at Valier, 2015. We found significantly higher yield in plots treated with imidacloprid+MetF52 and Mycotrol+azadirachtin (Xpulse) compared with control at Ledger. In 2016, no significant treatment effects were observed at either site. In summary, this study provides insight on what treatments should be explored in more detail despite variable results.

Type
Insect Management
Copyright
© Entomological Society of Canada 2017 

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Footnotes

Subject editor: Susan Bjornson

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