Figure 1.

The performance of two whitefly populations on tobacco. After rearing on cotton or tobacco for different generations, whiteflies were transferred to new tobacco plants. Then, the survival rate (a) and fecundity (b) of the two populations on tobacco were examined. After adaptation for more than 10 generations, survival rate (c), fecundity (d), and female ratio (e) of the two populations were tested on cotton and tobacco. Data shown are mean ± SE. n = 20. Statistically significant difference: *P < 0.05, **P < 0.01, ***P < 0.001. Different letters indicate significant differences between treatments at P < 0.05.