Rice weevils, Sitophilus oryzae (L.), lesser grain borers, Rhyzopertha dominica (F.), and Angoumois grain moths, Sitotroga cerealella (Olivier), discriminated among rough rice samples of the varieties ‘Colusa’, ‘Calrose’, ‘Nato’, ‘Belle Patna’, ‘Bluebelle’, and ‘Dawn’ in free-choice tests. Attractiveness was judged by the presence of adults, oviposition, and the production of F 1 progeny. All 3 species exhibited a definite nonpreference for ‘Dawn’. Intact hulls precluded kernel entry by rice weevils and excluded 91% of lesser grain borer larvae and 72.4% of Angoumois grain moth larvae. The different responses in free-choice tests were related to the tightness of the seed husk, but were not directly proportional to the amount of loose-hull kernels available. Unidentified factors apparently influenced the behavior of the insects. In no-choice tests with brown rice of each variety, the number of F 1 progeny produced did not differ significantly in any species tested.