There has been an effort over the last decade to enhance the effectiveness of wild-type baculoviruses using genetic engineering. Wild-type viruses are extremely sensitive to sunlight-ultraviolet, but, what about engineered, recombinant baculoviruses? We found that insertion of a foreign gene did not result in recombinant baculoviruses being more or less sensitive to simulated sunlight-UV than a parental wild-type baculovirus. The half-life of activity for all recombinants and the wild-type parental isolate we tested was within that previously reported for other baculoviruses.