Figure 1: The performance of M. persicae on pre-infested plants and control plants.

(a) Aphid weight after feeding for five days on non-infested plants (Control) and previously infested plants (Pre-infested). (b) Number of nymphs produced by per aphid after feeding for seven days. Aphids were born on treated Chinese cabbage plants and their weight or nymphs produced were examined after indicated time. Values shown are mean ± SE. *P < 0.05; Student’s t-test (Fig. 1a) or Mann-Whitney U test (Fig. 1b).