Figure 1
Survival of pink bollworm larvae from two resistant strains (Bt4-R2 and BX-R), a susceptible strain (APHIS-S), and their F1 progeny from mass crosses. Asterisks indicate 0% survival for APHIS-S and the F1 progeny from the two reciprocal mass crosses between Bt4-R2 and APHIS-S. Light blue: 3 μg Cry2Ab per mL diet (n = 32 larvae per bar or asterisk). Dark blue: 10 μg Cry2Ab per mL diet (n = 48 per bar or asterisk).
