Summary of number of infested and noninfested trees and the average Borer Infestation Score (BIS) values by surveyed areas. Developed BIS formula was applied to calculate BIS values for all trees during July 2020 survey. Average BIS values for trees for each respective area were obtained and compared against the general feedback of infestation level by managers.
| Serial number | Location | No. of infested trees | No. of noninfested trees | Average BIS score | Feedback |
|---|---|---|---|---|---|
| 1 | Bedok South Avenue 1 (BSA) | 35 | 32 | +0.0862 | High |
| 2 | East Coast Park Service Road (ECP) | 86 | 58 | +0.2932 | High |
| 3 | Geylang East Central (GEC) | 1 | 83 | −1.4218 | Low |
| 4 | Penjuru Road (PR) | 15 | 41 | −0.9846 | Low |
| 5 | Siglap Link (SL) | 16 | 21 | −0.5218 | Moderate |
| Total | 153 | 235 | - | - |