Virus epizootics in Californian populations of Spodoptera exigua: dominance of a single viral genotype

Gelernter, W.D.; Federici, B.A.

Virus epizootics in Californian populations of Spodoptera exigua: dominance of a single viral genotype

1990

Gelernter, W.D. | Federici, B.A.

Thirty isolates of a multinucleocapsid nuclear polyhedrosis virus from larvae of the beet armyworm, Spodoptera exigua, were collected during epizootics from a geographical area encompassing the Imperial, San Joaquin and southern Sacramento Valleys of California. Restriction enzyme analysis of viral DNAs with Bam Hi, Eco RI and Xho I revealed that one dominant viral genotype, similar to an isolate first described in 1978, was responsible for all epizootics in the areas sampled. Additionally, the genotype of an isolate collected in 1965 was dominant. Although variants of the dominant genotype were observed in isolates from several locations, the differences were minor in most cases. These results indicate that the annual epizootics which occur throughout California in populations of S. exigua are caused by a single virus and its closely related genotypic variants.

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