Table 4. Responses of Diaphorina citri when assayed with synthetic volatiles identified from Las-infected and non-infected citrus plants.
Chemical | Dosage (µg) | Proportion of D. citri responding to treatment arm | Proportion of D. citri responding to control arm | χ2 value | P value |
†β-ocimene (positive control) | 0.001 | 52.22 | 47.78 | 0.18 | 0.67 |
0.01 | 54.46 | 45.54 | 0.8 | 0.37 | |
0.1 | 53.19 | 46.81 | 0.38 | 0.54 | |
1 | 60.44 | 39.56 | 3.97 | 0.05* | |
10 | 61.46 | 38.54 | 5.04 | 0.02* | |
100 | 62.77 | 37.23 | 6.13 | 0.01* | |
D-limonene | 0.001 | 56.06 | 43.94 | 0.97 | 0.32 |
0.01 | 60.87 | 39.13 | 2.17 | 0.14 | |
0.1 | 54.39 | 45.61 | 0.44 | 0.51 | |
1 | 54.65 | 45.35 | 0.74 | 0.39 | |
10 | 60.24 | 39.76 | 3.48 | 0.06 | |
100 | 61.54 | 38.46 | 4.85 | 0.03* | |
Methyl salicylate | 0.001 | 54 | 46 | 0.32 | 0.57 |
0.01 | 60.44 | 39.56 | 3.97 | 0.04* | |
0.1 | 54.76 | 45.24 | 0.38 | 0.54 | |
1 | 45.12 | 54.88 | 0.78 | 0.38 | |
10 | 41.03 | 58.97 | 2.51 | 0.11 | |
100 | 39.56 | 60.44 | 3.97 | 0.04* | |
Methyl anthranilate | 0.001 | 58.06 | 41.94 | 0.81 | 0.37 |
0.01 | 57.14 | 42.86 | 0.71 | 0.4 | |
0.1 | 61.76 | 38.24 | 1.88 | 0.17 | |
1 | 57.33 | 42.67 | 1.61 | 0.2 | |
10 | 56.1 | 43.9 | 1.22 | 0.27 | |
100 | 52.27 | 47.73 | 0.23 | 0.63 |
†: β-ocimene carried 20–25% limonene. P values labeled with* are significantly different (χ2 test, P<0.05). Significant P values highlighted in bold indicate attraction while remaining significant P values indicate repulsion.