Journal of Insect Science: Vol. 7 | Article 49

Table 1. Effect of strain and diet on diapause proportion, rate of weight loss during overwintering, and initial weight of diapausing larvae (least squares means ± SE from multiple regression models are shown for last two variables, see text). Also shown is the average R² (± SE) of slopes used to estimate weight loss.

Strain	Diet	Diapause proportion	Rate of weight loss (mg /wk)	R²	Initial weight (mg)
MOV97	Non-Bt	0.39 ^a, ¹	1.19 (0.05) ^a, ³	0.96 (0.006)	35.9 (0.7) ^a, ⁵
MOV97 x MOV97-R₁₀	Non-Bt	0.70 ^b	0.92 (0.03) ^b	0.96 (0.004)	35.9 (0.5) ^a
MOV97 x MOV97-R₁₀₀	Non-Bt	0.79 ^b	0.87 (0.03) ^b	0.96 (0.004)	33.9 (0.5) ^a
MOV97-R₁₀	Non-Bt	0.82 ^b	0.85 (0.03) ^b	0.97 (0.004)	33.3 (0.5) ^b
MOV97-R₁₀₀	Non-Bt	0.77 ^b	0.96 (0.03) ^b	0.97 (0.004)	34.1 (0.5) ^b
MOV97-R₁₀	Bt	0.74 ^*, ²	0.84 (0.03) ^†, ⁴	0.95 (0.004)	32.2 (0.5) ^†, ⁴
MOV97-R₁₀₀	Bt	0.70 ^*	0.72 (0.03) ^†	0.96 (0.004)	31.1 (0.5) ^†

¹Values with different letters were significantly different in Pearson χ² tests comparing MOV97 to the F1 or the resistant strains (P < 0.05). Pearson χ² test comparing the F1 and resistant strains was not significant (P > 0.05).
²Pearson χ² tests comparing individuals from the resistant strains fed non-Bt and Bt diet.
^*P = 0.07.
³Values with different letters were significantly different in linear contrasts of least square means comparing MOV97 to the F1 or the resistant strains (P < 0.05). Linear contrast comparing the F1 and resistant strains was not significant (P > 0.05).
⁴Linear contrasts of least squares means comparing individuals from the resistant strains fed non-Bt and Bt diet.
^†P < 0.05.
⁵Values with different letters were significantly different in linear contrasts of least square means comparing MOV97 to the F1 or the resistant strains (P < 0.05). Linear contrast comparing the F1 and resistant strains was significant (P < 0.05).