| 1397045 |
cracks or splits |
|
split crotch and chain |
| 5062008 |
inrolled crack |
|
A spiral crack in a tree |
| 5054026 |
risk tree |
|
Cracks, seams on campground tree |
| 5055038 |
risk tree |
|
Long crack and decay |
| 5052015 |
cold injury (low temperature) |
|
A sealed-over frost crack. |
| 5052080 |
cracks or splits |
|
A sealed-over crack. |
| 5052100 |
lightning |
|
Lightning-struck tree with long wound |
| 5053037 |
risk tree |
|
Multiple defects (cracks, decay, poor branch angles) in a yard tree. |
| 5053054 |
risk tree |
|
Large tree with multiple defects, including cracks, decay, dead branches. |
| 5044080 |
risk tree |
|
Sealed-over crack with decay. |
| 5044081 |
risk tree |
|
Hazard tree crack with sawdust at base of tree, indicating decay. |
| 5042076 |
Armillaria root rots |
Armillaria spp. |
signs of armillaria visible in recent crack |
| 5050036 |
cracks or splits |
|
Branch with severe crack. |
| 5044003 |
cracks or splits |
|
Long spiral frost crack. |
| 5038036 |
cracks or splits |
|
Dead top with major split. |
| 5043054 |
cracks or splits |
|
Vertical seam closed with callus tissue. |
| 5050035 |
cracks or splits |
|
Sealed-over crack showing discoloration and decay in the center of the specimen. |
| 5035015 |
cracks or splits |
|
Branch split caused by codominant branching and included bark. |
| 5034077 |
cracks or splits |
|
Crack caused by narrow branch angle and included bark in Norway maple. |
| 5032097 |
mechanical |
|
Mechanical damage on a green ash tree, inlcuding a wound and a crack, caused by a vehicle. |
| 5033062 |
cracks or splits |
|
A red maple with a crack resulting from a bad branch union. |
| 5053033 |
included bark |
|
Crack starting at a codominant branch junction, with included bark. A very hazardous tree. |
| 5252002 |
included bark |
|
Poor branching angle with included bark, causing a crack all the way to the ground. |
| 5045022 |
lightning |
|
A lightning strike cleaved this 80' white pine from the top to the ground. |
| 5044092 |
inrolled crack |
|
|
| 5045054 |
imbedded objects |
|
|
| 5053002 |
imbedded objects |
|
|
| 5053043 |
shear crack |
|
|
| 5055091 |
imbedded objects |
|
|
| 5058035 |
inrolled crack |
|
|
| 5058036 |
inrolled crack |
|
|
| 5033060 |
cracks or splits |
|
|
| 5033061 |
cracks or splits |
|
|
| 5038029 |
cracks or splits |
|
|
| 5048016 |
inrolled crack |
|
Codominant branches with crack |
| 5048029 |
shear crack |
|
Codominant branches causing a shear crack. |
| 5048032 |
shear crack |
|
Codominant stems coming apart at the point of attachment |
| 5048038 |
inrolled crack |
|
Sugar maple with codominant stems and long crack. |
| 1397099 |
shear crack |
|
split at crotch |
| 1270006 |
shear crack |
|
codominant stems often reslut in a cracked trunk as the result of a weak branch union |
| 1409034 |
Compartmentalization Of Decay In Trees (CODIT) |
|
In this oak, the red arrows show the limits of an old wound. An open crack formed where callus first closed the injury. The green arrows point to radial shakes that split outward, while the blue arrows show ring shakes associated with other wounds. The purple arrows point to internal radial shakes. |
| 1409035 |
Compartmentalization Of Decay In Trees (CODIT) |
|
This black walnut was wounded at the green arrows when it was 1 inch in diameter. At the red arrows the calus infoll cut into the trunk and caused an internal crack. |
| 1409036 |
Compartmentalization Of Decay In Trees (CODIT) |
|
Multiple cracks form when many radial shakes associated with old wound split outward, as in this post oak. The cracks start at the circular barrier zone. |
| 1409037 |
Compartmentalization Of Decay In Trees (CODIT) |
|
When decay and cracks combine, as they did in this black locust, wall 2 is the tree's only defense against the spread of decay. |
| 1409038 |
Compartmentalization Of Decay In Trees (CODIT) |
|
A decayed basal sprout on this oak was a weak spot from which a crack spread inward at the purple arrows and outward at the red arrows. "S" indicates sapwood, "H" is heartwood, and the dotted line shows the boundary between them. |
| 1409039 |
Compartmentalization Of Decay In Trees (CODIT) |
|
This is a typical cracking pattern. The purple arrows point to where callus closed the wound. |
| 1409040 |
Compartmentalization Of Decay In Trees (CODIT) |
|
In response to insect wounds, this maple formed wall 4. Radial cracks developed later at the blue arrows. |
| 1409041 |
Compartmentalization Of Decay In Trees (CODIT) |
|
Wall 4 in this eucalypt separated to form a ring shake. Felling caused a radial crack at the 6 o'clock position. |
| 1409047 |
flush cut |
|
Flush cuts cause discoloration of sapwood, which normally transports and stores material. |
| 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. |
| 1408022 |
flush cut |
|
Cracks also start above flush-cut branches. One has started here at the pencil point on this maple which was flush-cut two years ago. |
| 1397042 |
shear crack |
|
|
| 1397046 |
shear crack |
|
|
| 1397078 |
shear crack |
|
Codominant stems with a major crack |
| 1397094 |
shear crack |
|
Severely decayed and defective large tree |
| 1397101 |
included bark |
|
weak union |
| 1407036 |
ribbed crack |
|
Many problems can be traced to wounds. The split seam in this piece of oak is called a frost crack, but the trouble actually began with an injury that occurred when the tree was one inch in diameter. As callus formed around the wound, a seam developed and later split. The tree may have been injured by a lawnmower or some type of equipment. If people knew the consequences of their actions, |
| 1408015 |
inrolled crack |
|
Wounds sometimes start as vertical cracks. |
| 1408016 |
cracks or splits |
|
Cracks can also develop from branch stubs, |
| 1408017 |
cracks or splits |
|
splitting up from a branch stub |
| 1408018 |
cracks or splits |
|
crack forming down from stub |
| 1408019 |
cracks or splits |
|
Other causes of cracks, especially on young or thin-barked trees, include holes for injections and implants. |
| 1408020 |
cracks or splits |
|
These large protruding splits are called frost cracks, a misnomer, since they begin with a wound, not frost. |
