Entomopathogenic agents isolated from 19 coleopteran insect pests in Egypt.
Surveys for naturally occurring microbial control agents were conducted in Alexandria governorate in Egypt between December 1998 and September 2001 among 19 coleopteran pests attacking stored products in store houses, apple orchards, trees of navel orange, fig, olive, Casuarina trees, date palms and the Canary Island palms. The natural disease mortality among surveyed insect species was due to at least one of the following entomopathogens: Bacillus thuringiensis, B. cereus, Brevibacterium sp., polyhedrosis viruses, Mattesia sp., and a Nosema sp. Their general incidence rates ranged between 0.1 and 28.6%. B. thuringiensis occurred in Bruchus lentis, Bruchus rufimanus, Macrotoma palmata, Xystrocera globosa, Oryzaephilus surinamensis, Rhynchophorus ferrugineus, Sitophilus granarius, S. oryzae, Anthrenus verbasci, Dermestes maculatus, Carpophilus hemipterus, Hypoborus ficus and Tenebroides mauritanicus. Bacillus sphaericus was also isolated from R. ferrugineus. Polyhedrosis viruses are isolated for the first time from naturally dead larvae of Lasioderma serricorne, Bruchus lentis, Bruchus rufimanus, Callosobruchus chinensis, M. palmata, R. ferrugineus, S. granarius, D. maculatus, Carpophilus hemipterus, Phloeotribus scarabaeoides, Tenebrio molitor and Tenebroides mauritanicus. Mattesia sp. is isolated for the first time from dead individuals of L. serricorne, S. granarius, A. verbasci and Tribolium castaneum.