Fig. 4. Feeding rate on radiolabelled `young' and `old' diets by three clones of Myzus persicae. Values are the means ± S.E.M. (N=15-20). Analysis of covariance (ANCOVA) after log-transformation of feeding rate: aphid protein content (covariate): F_1,111=9.31, P<0.05; diet: F_1,111=33.86, P<0.05; clone: F_2,111=52.90, P<0.05; interaction: F_2,111=1.09, P>0.1. ^*Significant difference between diets (two-sample t-test of log-transformed data: ADAS 99/13, RB/4158; or Mann—Whitney U-test of untransformed data: ADAS 99/12) using Bonferroni correction for multiple tests.

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