Abstract
The microflora of healthy larvae and adults of the southern pine beetle, Dendroctonus frontalis, were determined by aseptically excising portions of the fore-, mid-, and hindguts and culturing them on agar. Aerobacter aerogenes, Alcaligenes jaecalis, and Serratia marcescens were the principal species of bacteria recovered, and Aspergillus spp. and Penicillium spp. were the principal genera of fungi. Seven of the species recovered were identical with facultative or conditioned pathogens recovered from diseased beetles in other studies.