FIGURE 3.

(A) Frequency distributions of 1st-, 2nd-, and 3rd-instar larvae, and (B) development speed (=proportion of larvae reaching 3rd-instar) of larvae of Western corn rootworm in trials concluding 10 days after neonates were allowed to feed on one of four plant types. Plant types were Balsas teosintes (BTEO), Mexican maize landraces (MXLR), US maize landraces (USLR), and US inbred maize lines (USIL), and are ordered from most ancestral to most derived. A priori, pair-wise comparisons between frequency distributions representing the domestication (BTEO vs. MXLR) and breeding (USLR vs. USIL) transitions were significant (*G ≥ 17.25, P < 0.001), while the comparison representing the spread transition (MXLR vs. USLR) was not significant (G = 2.34, P = 0.309); the critical P-value for these comparisons was set at P ≤ 0.017, per Sidak’s correction. Univariate analysis of variance (ANOVA) indicated that development speed did not vary across plant types (F_3,8 = 2.33, P = 0.150).