List of recorded variables during tree survey. Variables 2, 3, and 4 were recorded as ratios to account for different canopy sizes in rain trees. Variables 5, 6, and 7 were recorded as numerical values based on predefined categories for quick estimation (extent defoliation) or to provide basis for quantitative calculation (canopy colour and lowest position of bark peeling or exit holes).
| Serial number | Variable | Unit |
|---|---|---|
| 1 | Infestation status | Infested or noninfested |
| 2 | Number of major branches with bark peeling symptom:Number of major branches | Ratio |
| 3 | Number of major branches with exit hole symptom:Number of major branches | Ratio |
| 4 | Number of major branches with dieback symptom:Number of major branches | Ratio |
| 5 | Canopy colour | (1) Green or (2) chlorotic |
| 6 | Extent of defoliation | (1) 0% to 20% (2) 21% to 40% (3) 41% to 60% (4) 61% to 80% (5) 81% to 100% |
| 7 | Lowest position of bark peeling or exit holes | (1–6) Refer to Figure 1 (7) No observable bark peeling or exit holes |