Spatial distribution of attack density, mortality, and sex ratio of S. multistriatus based on counts in cut sections removed from main stem and three major branches of Chinese elm tree showing copious sap flow.
| Tree section | Surface area in dm2 | No. of penetrations to inner bark per dm2 | Tunnel density per dm2 | Dead beetles in tunnels per dm2 of surface | Sex ratio (m:f) in tunnels | Dead beetles on the bark per dm2 of surface | Sex ratio (m:f) on the bark |
|---|---|---|---|---|---|---|---|
| Lower stem | 54.8 | 4.8 | 18.3 | 10.0 | 1:9.2 | 7.0 | 1:1.3 |
| Middle stem | 46.2 | 3.5 | 16.9 | 7.3 | 1:7.6 | 5.9 | 1:1.3 |
| Upper stem | 39.4 | 3.1 | 14.6 | 6.4 | 1:11.2 | 5.2 | 1:1.2 |
| Branch #1 | 26.4 | 2.4 | 14.2 | 3.0 | 1:8.4 | 2.0 | 1:1.2 |
| Branch #2 | 25.2 | 2.1 | 14.1 | 3.2 | 1:7.1 | 2.2 | 1:1.3 |
| Branch #3 | 24.6 | 3.3 | 13.8 | 2.9 | 1:9.5 | 2.9 | 1:1.2 |
| Total | 216.6 | (745) 3.4 | (3,074) 14.1 | (1,289) 5.9 | 134:1,155 | (836) | 372:464 |
| Mean | 3.4 | 14.1 | 5.9 | 1:8.6 | 3.9 | 1:1.2 |