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    Author(s): J.D. Podgwaite; R.B. Bruen; M. Shapiro
    Date: 1983
    Source: Entomophaga. 28: 9-16.
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: Download Publication  (415.1 KB)


    Samples of a gypsy moth nucleopolyhedrosis virus product, Gypchek®, were taken each day during a 100-day production run and monitored for the presence of pathogenic bacteria and fungi. The standard plate count/g of product was 5.97 ± 1.51 x 108 over the 100-day period, while the sporulating bacteria count was 3.81 ± 1.21 x 106/g. We did not detect obligate anaerobic or fecal coliform bacteria in any of the samples. Bacillus cereus, Staphylococcus epidermidis, B. licheniformis, Streptococcus faecalis, Serratia liquefaciens, and Aspergillus niger were the most frequently isolated microorganisms. We did not detect primary pathogenic bacteria or fungi, but the presence of opportunistic pathogens indicated that assiduous monitoring of the virus production facility and rigorous quality control of production batches are necessary.

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    Podgwaite, J.D.; Bruen, R.B.; Shapiro, M. 1983. Microorganisms associated with production lots of the nucleopolyhedrosis virus of the gypsy moth Lymantria dispar (Lep.: Lymantriidae). Entomophaga. 28: 9-16.

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