Evaluation of toxicity of biorational insecticides against larvae of the alfalfa weevil

dc.contributor.authorReddy, Gadi V. P.
dc.contributor.authorAntwi, Frank B.
dc.contributor.authorShrestha, Govinda
dc.contributor.authorKuriwada, Takashi
dc.date.accessioned2016-07-20T13:11:51Z
dc.date.available2016-07-20T13:11:51Z
dc.date.issued2016-05
dc.description.abstractThe alfalfa weevil, Hypera postica (Coleoptera: Curculionidae), is a major pest of alfalfa Medicago sativa L. (Fabaceae). While H. postica usually causes the most damage before the first cutting, in summer of 2015 damaging levels of the pest persisted in Montana well after the first harvest of alfalfa. Although conventional insecticides can control H. postica, these chemicals have adverse effects on non-target organisms including pollinators and natural enemy insects. In this context, use of biorational insecticides would be the best alternative options, as they are known to pose less risk to non-target organisms. We therefore examined the six commercially available biorational insecticides against H. postica under the laboratory condition: Mycotrol <sup>®</sup> ESO (Beauveria bassiana GHA), Aza-Direct <sup>®</sup> (Azadirachtin), Met52 <sup>®</sup> EC (Metarhizium brunneum F52), Xpectro OD <sup>®</sup> (Beauveria bassiana GHA+pyrethrins), Xpulse OD <sup>®</sup> (Beauveria bassiana GHA+Azadirachtin) and Entrust WP <sup>®</sup> (spinosad 80%). Concentrations of 0.1, 0.5, 1.0, and 2.0 times the lowest labelled rates were tested for all products. However, in the case of Entrust WP, additional concentrations of 0.001 and 0.01 times the lowest label rate were also assessed. Mortality rates were determined at 1 to 9days post treatment. Based on lethal concentrations and relative potencies, this study clearly showed that Entrust was the most effective, causing 100% mortality within 3days after the treatment among all the tested materials. With regard to other biorational, Xpectro was the second most effective insecticide followed by Xpulse, Aza-Direct, Met52, and Mycotrol. Our results strongly suggested that these biorational insecticides could potentially be applied for H. postica control.en_US
dc.description.sponsorshipProfessional Development Program of the USDA-Western Sustainable Agriculture Research and Education project #2014-38640-22175/Utah State University subaward # 140867038; and USDA National Institute of Food and Agriculture, Multistate Project W3185, The Working Group Biological Control of Pest Management Systems of Plants [Accession number# 231844]en_US
dc.identifier.citationReddy, Gadi V.P. , Frank B. Antwi, Govinda Shrestha, and Takashi Kuriwada. "Evaluation of toxicity of biorational insecticides against larvae of the alfalfa weevil." Toxicology Reports 3 (May 2016): 473-480. DOI: 10.1016/j.toxrep.2016.05.003.en_US
dc.identifier.issn2214-7500
dc.identifier.urihttps://scholarworks.montana.edu/handle/1/9941
dc.titleEvaluation of toxicity of biorational insecticides against larvae of the alfalfa weevilen_US
dc.typeArticleen_US
mus.citation.extentfirstpage473en_US
mus.citation.extentlastpage480en_US
mus.citation.journaltitleToxicology Reportsen_US
mus.citation.volume3en_US
mus.data.thumbpage2en_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.identifier.doi10.1016/j.toxrep.2016.05.003en_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.departmentResearch Centers.en_US
mus.relation.researchgroupWestern Triangle Ag Research Center.en_US
mus.relation.universityMontana State University - Bozemanen_US

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