Abstract
Prevalence of the nuclear polyhedrosis virus (NPV) granulosis virus (GV) was determined in populations of fall armyworm, Spodoptera frugiperda , in southeastern Louisiana. Both diseases reached their peak mean infection rates in mid-August in fall armyworms infesting pastures, the NPV at 50.8% and the GV at 2.8%. NPV prevalence in some pastures peaked at 60 to 68%. Infection rates by NPV in fall armyworms infesting corn and sorghum were initially lower than in pastures but were similar after mid-July (corn) or late July (sorghum). Infections by a mermithid nematode, an entomogenous fungus, and a microsporidium were rare.
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