Selection differentials and gradients for life-history trait plasticities of <i>Sitobion avenae</i> clones collected from barley, oat and wheat in two areas.

<p>Note: DT1-DT4, the developmental time of 1^st to 4^th instar nymphs; DT5, the total developmental time of nymphs; *, <i>P</i><0.05; **, <i>P</i><0.01; ***, <i>P</i><0.001.</p><p>Selection differentials and gradients for life-history trait plasticities of <i>Sitobion avenae</i> clones collected from barley, oat and wheat in two areas.