Figure 1. Mean feeding preference (PI) indices ( S.E.) of bean leaf beetles in dual-choice feeding preference tests 5, 10, 12, 14, 16, 20 and 25 days after herbivory on PI 227687 leaflets from control plants and plants exposed to bean leaf beetle feeding. Mean PI values were derived from 10 replicates of each test combination. Means followed by the same letter are not significantly different (p<0.05) by protected LSD.