Factors influencing the attraction to oviposition of the potato tuber moth, Gnorimoschema operculella Zell.
In further investigations on the association of Phthorimaea (Gnorimoschema) operculella (Zell.) with solanaceous plants [cf. preceding abstract], in which leaves of six solanaceous species were tested, those of potato were found to be the most attractive to ovipositing females. Egg-plant [Solanum melongena] was the next most attractive; some species showed virtually no attraction. Fecundity was higher in adult females that had been fed as larvae on potato tubers than in those reared on the leaves of potato or other food-plants. Feeding on a particular plant in the larval stage did not influence the oviposition preferences of the adult female. Of six artificial substrates for testing solanaeous extracts as stimulants for oviposition, cheese cloth was the most suitable, and in choice experiments with cheese cloth and potato leaves, 15% of eggs were laid on the cloth.