Infectivity tests were conducted with several species of Bacillus and a fungus, Beauveria bassiana (Balsamo) Vuillemin, against Fannia canicularis (L.) and F. femoralis (Stein). Results of qualitative tests with bacteria were variable, and relatively few of the isolates were capable of producing moderate (40-60%) levels of mortality against larvae of F. canicularis, which was the most susceptible
... [Show full abstract] of the host species. The most effective bacterium, causing 67% kill, was an unidentified variety of B. thuringiensis Berliner. The NRRL A-6511 strain of B. bassiana produced higher levels of mortality against larvae of both species of host than the comparative bacteria, and caused up to 87% kill of F. femoralis larvae after 3 successive passages through susceptible hosts.