Non-choice feeding assays were conducted to determine the effect of Kentucky bluegrass on black cutworm larval growth. Six Kentucky bluegrass,Poa pratensis L., cultivars and one creeping bentgrass, Agrostis stolonifera L., (a known susceptible host), were tested. The effect of plant age (< 60 d versus > 1 yr old after planting) on larval weight gain (mg) and survival were determined at 7, 10, and 14 d. A significant difference was observed for larval growth and survival between several cultivars; several Kentucky bluegrass cultivars exhibited resistance. Subsequent black cutworm larvae reared on the aforementioned cultivars showed reduced development, lower weight gain, and increased mortality.