Figure 5
Effects of different concentrations of trans-2-pentenal on downy mildew in air volume. Leaf disks were treated with water (control) or trans-2-pentenal at different concentrations expressed in mg/L of air volume. Trans-2-pentenal was applied on a filter paper disk without contact with leaf tissues. Five replicates (dishes with five disks each) were assessed for each concentration and the experiment was carried out twice. As Kruskal-Wallis test indicated no significant differences between two experiments (p > 0.05, n = 5 replicates per experiment), data from the two experiments were pooled. The pooled mean and standard error values of ten replicates from the two experiments are presented for each treatment. Letters indicate significant differences among concentrations according to the Kruskal-Wallis test (p ≤ 0.05). Asterisks indicate phytotoxic effects on leaf disks.
