Ed Hosoda

Woodland, California, United States Contact Info
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About

Most Current Presentations/Publications:
Phosphine Resistance in Adult and Immature…

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Experience & Education

  • Cardinal Professional Products

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Licenses & Certifications

  • New York Pesticide Applicator

    New York State Department of Environmental Conservation

    Issued
    Credential ID C0877035

  • Structural Pest Control Operator Branch 1 & 2

    CA Structural Pest Control Board

    Issued
    Credential ID OPR 7663 Branch 1 and 2

  • California Pest Control Advisor

    CA Department of Pesticide Regulation

    Issued
    Credential ID 75339

  • Qualified Applicators License

    CA Department of Pesticide Regulation

    Issued
    Credential ID 97106

Publications

  • Phosphine resistance in saw-toothed grain beetle, Oryzaephilus surinamensis in the United States

    Journal of Stored Products Research

    Abstract
    Phosphine (PH3) fumigation resulting in sub-lethal exposure has led to the development of phosphine resistance in many stored-product insect species worldwide and is a major challenge to the continued effective use of phosphine. In 2016 phosphine resistance was found in Tribolium castaneum (Herbst) and Plodia interpunctella (Hübner) collected from California dried fruit and nut processing facilities. Although Oryzaephilus surinamensis (L.) infests grain, dried fruit, and nuts in…

    Abstract
    Phosphine (PH3) fumigation resulting in sub-lethal exposure has led to the development of phosphine resistance in many stored-product insect species worldwide and is a major challenge to the continued effective use of phosphine. In 2016 phosphine resistance was found in Tribolium castaneum (Herbst) and Plodia interpunctella (Hübner) collected from California dried fruit and nut processing facilities. Although Oryzaephilus surinamensis (L.) infests grain, dried fruit, and nuts in storage and processing facilities, phosphine resistance in this species has not been studied in the United States. In this study, the discriminating dose of phosphine for O. surinamensis eggs was estimated using a laboratory susceptible strain; it was found to be 28.4 ppm over a 72-h fumigation period (1 mg/L of phosphine = 714.18 ppm or 1 ppm = 0.0014 mg/L). Discriminating dose bioassays were used to determine phosphine resistance in both eggs and adults of 14 different populations collected from California and Oklahoma. Resistance to phosphine was detected in four out of 14 populations in adults and nine out of 14 populations in eggs and ranged from 2 to 100%. Phosphine percent survival values in both adults and eggs of three populations, namely, Box BR, Box BF, and OKWat were >90%. Lethal concentration values required to kill 99% of individuals in samples for adults of these three populations were predicted as 320.5, 290.7, and 263 ppm, respectively, and those for eggs were 1030.7, 1055.9, and 564.5 ppm, respectively, over a 72-h fumigation period. This study confirms that phosphine resistance is present in O. surinamensis in the United States.

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  • Phosphine Resistance in Adult and Immature Life Stages of Tribolium castaneum and Plodia interpunctella Populations in California

    Journal of Economic Entomology

    Other authors
    • S.G. Gautam
    • G.P. Opit
    See publication

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