Abstract
In laboratory pathogenicity tests with the eastern subterranean termite, Reticulitermes flavipes (Kollar), Entomophthora coronata Kevorkian produced a mortality of 97 percent 84 hours after inoculation. Entomophthora virulenta Hall and Dunn was found to be nonpathogenic under similar conditions. In a virulence test against termites, two isolates of E. coronata showed no significant difference. Histological examination indicated that germ tube penetration of the integument resulted before death of the termite and apparently was not restricted to a particular site. In the digestive tract, germinating conidia of E. coronata were found penetrating the oesophageal wall but not the crop, midgut and hindgut. Invading hyphae first attacked the fat body and musculature and then rapidly destroyed the remaining tissue as early as 32 hours after inoculation.
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