| 1241636 |
drought |
|
Under extreme drought conditions, even mature trees can be severely damaged. This tree had shed older needles first but as the drought continued, the terminal and branch tips have died back. Crown thinning due to drought is typically nonuniform as seen here. |
| 1241637 |
drought |
|
This sapling exhibits symptoms of chronic drought; thin crown, short needles, and short terminal growth. |
| 1241647 |
chemicals |
|
Douglas-fir damaged several miles downwind from release site of chloring gas. Outer foliage was killed and shed within two weeks of exposure. |
| 1241648 |
chemicals |
|
Trees of several species died after calcium chloride dust abatement was applied to the road. |
| 1241649 |
chemicals |
|
Foliage symptoms of calcium chloride injury. Symptoms developed in the spring following a late summer application. |
| 1241756 |
sunscald |
|
Sunscald is seen on the south side of thin-barked trees. |
| 1241757 |
mechanical |
|
Fresh mechanical wound with resin. The bark was torn away and the wood gouged during logging. Frayed wood and bark are evidnece of mechanical injury. |
