Bionomics of the potato tuberworm, Gnorimoschema operculella Zeller (Lepidoptera: Gelechiidae) in Karnataka.
Surveys conducted in the potato-growing areas of Hassan and Bangalore Districts of the Indian state of Karnataka during 1969-70 showed that the incidence of Phthorimaea operculella (Zell.) (Gnorimoschema operculella) on leaves in the field and on tubers in storage was 1.9-22.00 and 0-12.5%, respectively. Potato was the preferred food-plant in the field. Brief descriptions of the life stages are given. The egg, larval and pupal stages lasted 5, 15 and 5-6 days, respectively, on leaves in the field and 5, 19.6 and 8.5 days on tubers in the laboratory. The preoviposition, oviposition and postoviposition periods lasted 1-1.5, 4-7 and 1-2 days. Females laid an average total of 72.5 eggs, and the gelechiid could complete 13 generations in a year in the laboratory.