Long grain (Cocodrie var.), medium grain (M-205 var.), and short grain (S-102 var.) rough rice was examined for susceptibility to the lesser grain borer, Rhyzopertha dominica (F.). Parent adults were exposed for two weeks on each variety and progeny production was assessed after eight weeks. Rice was analyzed for amylose content, weight, and moisture content. Hardess of the rough rice hull was measured by the Single Kernel Characterization System (SKSC). Split and cracked hulls were positively correlated with neonate entry and subsequent progeny development, but the measured chemical and physical characters were not correlated with progeny production. Neonates could not penetrate solid rice hulls of the three varieties used for the test, and required a crack in the hull to gain entry. Expanded tests conducted with additional varieties show considerable variability in susceptiblity to lesser grain borer among varieties within each category of rough rice.