Four entomopathogenic viruses and one each of an entomopathogenic bacterium, fungus, and protozoan were inactivated when exposed to ultraviolet light; the half-life was less than 4 h in every instance. Relative ranking in stability of the entomopathogens was as follows: B. thuringiensis Berliner > Nomuraea rileyi (Farlow) Samson > entomopox Virus > nucleopolyhedrosis virus = cytoplasmic polyhedrosis virus > Vairimorpha (= Nosema ) necatrix (Kramer) > granulosis virus.
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Ignoffo et al. (1977) studied this question.