Parameter estimates (±SE), AIC and difference in AIC from best models fitting log transformed LC₅₀ estimates of resistance in <i>L</i>. <i>decemlineata</i> populations.

a Parameter estimate differs significantly from zero (*, P < 0.05) b Proportion potato grown on available cropland in the year bioassays were conducted c Proportion cultivated cropland where potato was grown at least once in the four years preceding the bioassay d Represents the interaction between specified model parameter and state Parameter estimates (±SE), AIC and difference in AIC from best models fitting log transformed LC50 estimates of resistance in L. decemlineata populations.