<i>Myzus persicae</i> phloem feeding activities and honeydew production rate on different-aged cabbage leaves.

<p>Total probing time (A), mean phloem feeding duration (B), total phloem feeding duration (C), and honeydew production (D) by <i>M</i>. <i>persicae</i> on cabbage leaves. Different letters above the bars indicate significant differences (<i>P</i> < 0.05). Values are means ± SE (n = 22–25 for figs A-C; n = 5 for fig D).