Abundance of the Colorado potato beetle,Leptinotarsa decemlineata(Say), was compared on cultivars of potato that differed in time to maturity (persistence), foliar biomass, and foliar concentrations of N. Longer-season cultivars produced more (although not consistently significant) foliage than shorter-season cultivars. Foliar concentrations of N were higher in most longer-season cultivars than in shorter-season cultivars. Abundance of beetles was not significantly different among most cultivars on most sample dates. Beetle abundance was significantly positively correlated with cultivar persistence, foliar biomass, and foliar N concentration. Multiple regression techniques indicated that foliar N was a better predictor of beetle abundance than foliar biomass.