Interactions of fungal entomopathogens with synthetic insecticides for the control of Kuschelorhynchus macadamiae (Coleoptera: Curculionidae)

Khun, Kim Khuy ORCID: https://orcid.org/0000-0002-6937-2721 and Ash, Gavin J. and Stevens, Mark M. and Huwer, Ruth K. and Wilson, Bree A. L. (2021) Interactions of fungal entomopathogens with synthetic insecticides for the control of Kuschelorhynchus macadamiae (Coleoptera: Curculionidae). Journal of Applied Entomology, 145 (6). pp. 553-566. ISSN 0931-2048


Abstract

This study investigated the interactions between insecticides (acephate and indoxacarb) and fungal entomopathogens (Beauveria bassiana [Bals.-Criv.] Vuill. strain B27, Metarhizium anisopliae [Metschn.] Sorokin strain ECS1, and a commercial B. bassiana product, Velifer® Biological Insecticide) for controlling the macadamia seed weevil, Kuschelorhynchus macadamiae Jennings and Oberprieler, in the laboratory and glasshouse. In the laboratory, additive interactions between insecticides at their full field concentrations (776 mg AI/L of acephate and 75 mg AI/L of indoxacarb) and fungal entomopathogens at 107 conidia/ml (ECS1 and B27) or at full field concentration (0.5 ml of Velifer®/L) were seen at 6 days and 12 days post-application. Under the same experimental conditions, synergistic interactions against K. macadamiae were observed 6 days post-application when fungal entomopathogens at 2.5 × 106 conidia/ml or at 25% of full field concentration (Velifer®) were co-applied with insecticides at 25% of their full field concentrations, whilst additive interactions were again observed at 12 days post-application. In the glasshouse, additive interactions between insecticides (at full field concentrations) and fungal entomopathogens (at 107 conidia/ml, or at full field concentration for Velifer®) were obtained at 6 days and 12 days post-application. The results from this study suggest that acephate and indoxacarb have both synergistic and additive effects against K. macadamiae when deployed together with fungal entomopathogens, depending on the initial concentrations of mixture components. Combined application of entomopathogens with compatible insecticides promises to provide more effective management of K. macadamiae than individual chemical applications.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Date Deposited: 17 Jun 2021 00:50
Last Modified: 21 Oct 2021 00:21
Uncontrolled Keywords: acephate, Beauveria bassiana, combined application, indoxacarb, Metarhizium anisopliae, synergy
Fields of Research (2008): 07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070108 Sustainable Agricultural Development
07 Agricultural and Veterinary Sciences > 0706 Horticultural Production > 070603 Horticultural Crop Protection (Pests, Diseases and Weeds)
Fields of Research (2020): 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3002 Agriculture, land and farm management > 300210 Sustainable agricultural development
30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3008 Horticultural production > 300804 Horticultural crop protection (incl. pests, diseases and weeds)
Socio-Economic Objectives (2008): B Economic Development > 82 Plant Production and Plant Primary Products > 8202 Horticultural Crops > 820206 Macadamias
Socio-Economic Objectives (2020): 26 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 2605 Horticultural crops > 260507 Macadamias
Identification Number or DOI: https://doi.org/10.1111/jen.12879
URI: http://eprints.usq.edu.au/id/eprint/42222

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