USDA Forest Service
| 4 Images of 3 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 1407041 | human caused injury | Collecting maple syrup is a yearly ritual. Several taps a year will not harm the tree, but too many will strain its recuperative powers and cause internal injury. | |
| 1408073 | cabling | Avoid cables angles that will cause screws to move, thus inhibiting firm closure. | |
| 1408021 | human caused injury | This oak was severely wounded when it was small. A crack later formed over the callus closure. Lawn mowers cause many injuries that later become cracks. Injured roots or roots killed during planting may also lead to cracks five or even 10 years later. | |
| 1407042 | bracing | The same advice goes for inserting hardware to strengthen branches and trunks, |


