“…Under appropriate environmental conditions, N. rileyi has been reported to drastically reduce populations of pest noctuids in the United States, Mexico, Ecuador, Brazil, Argentina, India, and Australia (Carner, 1980;Corrêa and Smith, 1975;Faria et al, 1993;Vimala Devi et al, 2003). Research has shown that N. rileyi isolates collected from diVerent insect hosts and geographical locations possess variable biological properties (Boucias et al, 1982;IgnoVo and Boucias, 1992;Molina-Ochoa et al, 2003). For example, N. rileyi isolates originating from Spodoptera frugiperda were more virulent to S. frugiperda than were N. rileyi isolated from Anticarsia gemmatalis (Tigano-Milani et al, 1995).…”