Table 2 Effect of diet on adult fecundity and hatch

Treatment # egg masses/ day/pair eggs/ mass % hatch # of offspring pair/day % pairs yielding no hatchlings Plant Leaf 1.7 ± 0.1a 26.8 ± 2a 77.4 ± 3.3a 33.2 ± 2.8a 7 ± 7a P-diet-I 0.24 ± 0.03d 19.4 ± 1.1b 35.8 ± 4.6cd 1.2 ± 0.3c 37 ± 7c LP-diet-I 0.39 ± 0.03c 23.9 ± 1.2ab 52.2 ± 3.7bc 4.3 ± 0.8b 17 ± 4abc P-diet-II 0.55 ± 0.03b 21.3 ± 1.2ab 35.4 ± 3.6d 3.4 ± 0.6b 7 ± 3a LP-diet-II 0.44 ± 0.03bc 23.2 ± 1.1ab 54.0 ± 4.0b 4.6 ± 0.5b 15 ± 3ab L-diet 0.24 ± 0.02cd 17.5 ± 1.7ab 70.0 ± 8.0ab 3.1 ± 0.7bc 30 ± 0bc

P-diet-I and LP-diet-I = eggs were laid by P and F1 generations that had been reared on Potato and Lettuce+Potato diets, respectively; P and LP-diet-II = eggs were laid by F7 and F8generations that had been reared on Potato and Lettuce+ Potato diets, respectively; and L = eggs were laid by F8 generation beetles reared on the Lettuce diet during the F8 generation (P through F7 generations had been fed the Lettuce+Potato diet). See Table 1 for a description of the diets. For each experimental group except the control group, at least 10 pairs of beetles were mated, and each experiment was performed at least three times. For the control group, the experiment was repeated two times. For each parameter, a one-way ANOVA and the Tukey's HSD test were used to determine if there were significant differences among treatment groups. Means ( S. E.) in the same column followed by the same letter were not significantly different.