COMPARATIVE BIOLOGY AND SUSCEPTIBILITY OF PLODIA-INTERPUNCTELLA (LEPIDOPTERA, PYRALIDAE) POPULATIONS TO A GRANULOSIS-VIRUS

LC50 values were determined for six populations (two laboratory and four wild-type) of Indianmeal moth, Plodia interpunctella (Hübner), to peroral inoculations of a granulosis virus. Various biological parameters of the populations were measured to determine similarities or differences among the moth populations tested. A significantly (P < 0.05) higher LC50 value was measured for two of the wild-type populations (one from the west coast and one from the east coast) compared with the others. These two populations also had significantly (P < 0.05) longer developmental times. The response and developmental data obtained for the other four populations (two laboratory and two wild-type) were not significantly (P > 0.05) different among them, but showed them to be more susceptible to the virus and with shorter developmental times compared with the two wild-types discussed above. © 1990 Entomological Society of America.