Figure 3.

Survival and weight gain of first-instar monarch larvae feeding on milkweeds placed at 3 m inside and outside the edge of plots consisting of Bt11, non-Bt (untreated), and non-Bt (λ-cyhalothrin-treated) sweet corn in Maryland. Data are based on separate bioassays conducted at 3, 6, and 9 days of anthesis. Within each graph, columns with the same lowercase letters are not significantly different for the interaction effect; pairs of columns with the same uppercase letters are not significantly different for the treatment effect (P < 0.05; Tukey's test).