Field research was conducted during 1990, 1991, and 1992 to examine effects of plant density on rice water weevil,Lissorhoptrus oryzophilusKuschel, oviposition in rice,Oryza sativaL. Results of the plant density study showed that there was a trend for more eggs per plant at lower densities, but a trend toward more eggs per unit area with higher plant densities. Plant densities influenced rice water weevil oviposition during the first 3 wk of permanent flooding. However, plant spacing cannot be manipulated to control rice water weevil infestation because recommended optimum plant densities do not differ significantly in their effect on oviposition.