Figure 2. Effect of time in diapause and diet (combined) on the proportion of overwintering survival (least squares means from multiple regression model, see text). Standard errors (not shown) associated with proportions were always equal or smaller than 0.08. * Linear contrast showed a significant difference (P < 0.05) between individuals from MOV97-R10 fed a Bt or non-Bt diet. ** Linear contrasts showed a significant difference between the F1 progeny and MOV97 or the resistant strains, but no significant differences (P > 0.05) between MOV97 and the resistant strains.