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    Author(s): J.D. Podgwaite; V.V. Martemyanov; J.M. Slavicek; S.A. Bakhavalov; S.V. Pavlushin; N. Hayes-Plazolles; R.T. Zerillo
    Date: 2013
    Source: Journal of Entomological Science. 48(4): 332-344.
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: View PDF  (6.62 MB)

    Description

    Gypchek is a gypsy nucleopolyhedrovirus (LdMNPV) product used for management of European gypsy moth (Lymantria dispar dispar L.) in the Unlted States, primarily in areas where the use of broad-spectrum pesticides is not appropriate. Similar LdMNPV products are used in Russia for control of a flighted-female strain of Asian gypsy moth (Lymantria dispar asiatica Vnukovskij), an insect not yet established in the United States. Gypchek is a mixture of LdMNPV genotypic variants and is being developed further toward a single, high-potency genotype product that is effective against both European and Asian strains. We isolated 5 LdMNPV genotypic variants from Gypchek and, through diet incorporation bioassays, assessed their potencies for both a laboratory strain of European gypsy moth and a wild Asian gypsy moth strain. Bioassays conducted in the United States showed that 2 viral isolates, 122b and 122-HP, were about 3 times as potent as Gypchek against European gypsy moth. Bioassays conducted in Russia showed that 122-HP was as effective as a wild Siberian LdMNPV against a wild Asian (Siberian) strain of gypsy moth. Both 122-HP and 122b were shown to be at least as effective as Gypchek in killing European gypsy moth larvae when formulated at a high dose and sprayed on oak foliage in a ground-based field test. Overall results indicated that both 122b and 122-HP are potential candidates for further development as a single-genotype Gypchek product.

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    Citation

    Podgwaite, J.D.; Martemyanov, V.V.; Slavicek, J.M.; Bakhavalov, S.A.; Pavlushin, S.V.; Hayes-Plazolles, N.; Zerillo, R.T. 2013. Potency of nucleopolyhedrovirus genotypes for European and Asian gypsy moth (Lepidoptera: Lymantriidae). Journal of Entomological Science. 48(4): 332-344.

    Keywords

    gypsy moth, nucleopolyhedrovirus, genotypic variants, bioassay

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https://www.fs.usda.gov/treesearch/pubs/49397