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USDA Forest Service

The U.S. Department of Agriculture Forest Service is a Federal agency that manages public lands in national forests and grasslands. The Forest Service is also the largest forestry research organization in the world, and provides technical and financial assistance to state and private forestry agencies. Gifford Pinchot, the first Chief of the Forest Service, summed up the purpose of the Forest Service—"to provide the greatest amount of good for the greatest amount of people in the long run."
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Image Subject Name Scientific Name Description
1593002 rodents Winter rodent feeding at the base of young sugar Maple trees
5254093 canker Bleeding canker on landscape oak. Cause unknown.
5051090 Eutypella canker Eutypella parasitica
5051084 Eutypella canker Eutypella parasitica "Cobar-head" canker on sugar maple.
5051085 Eutypella canker Eutypella parasitica
5051086 Eutypella canker Eutypella parasitica Black sporocarps of Eutypella parasitica on the surface of a canker on sugar maple.
5051087 Eutypella canker Eutypella parasitica
5051088 Eutypella canker Eutypella parasitica
5038070 mossy maple polypore Oxyporus populinus Sporocarps of Oxyporus populinus fruiting on the surface of a Eutypella canker. Oxyporus is commonly associated with Eutypella cankers.
5037090 Eutypella canker Eutypella parasitica
5038009 Eutypella canker Eutypella parasitica
5038034 Leucostoma canker of spruce Leucostoma kunzei Resin flow over branch canker.
5252007 Eutypella canker Eutypella parasitica Large Eutypella canker causing structural defect
5297082 canker Bleeding on surface of bark; cause unknown.
5297083 canker Bleeding on bark surface; cause unknown.
5251062 canker Bleeding on oak, unknown cause.
5034002 Eutypella canker Eutypella parasitica A large Eutypella canker at the base of a sugar maple.
5033098 Eutypella canker Eutypella parasitica A Eutypella canker at the base of a sugar maple.
5033099 Eutypella canker Eutypella parasitica A Eutypella canker ("cobra-head" canker) on sugar
5048058 canker
5049057 canker
1408052 Compartmentalization Of Decay In Trees (CODIT) On these red maple samples, cambial dieback is consistent on all wounds, whether treated or control.
1506072 chestnut blight or canker Cryphonectria parasitica Chestnut blight - stem canker
1502078 orange hobnail canker Cryphonectria gyrosa Endothia gyrosa canker; spanish oak
1502081 Gibberella canker Gibberella baccata Fusarium lateritium canker; mulberry
1502082 Gibberella canker Gibberella baccata Fusarium lateritium canker; mulberry
5029042 Eutypella canker Eutypella parasitica A large canker on the main stem of a sugar maple
5029043 Eutypella canker Eutypella parasitica A main stem canker
5029044 Eutypella canker Eutypella parasitica Severe deformation of a tree caused by Eutypella parasitica.
5029045 Eutypella canker Eutypella parasitica Swollen, deformed stem at site of canker.
5028048 butternut canker Sirococcus clavigignenti-juglandacearum Cankers often ooze sap from beneath the bark.
1408053 Compartmentalization Of Decay In Trees (CODIT) We found many decay-causing fungi in tissue taken from treated and control wounds. If a client insists on using wound dressing, apply a very thin coat but only after you've compelted all the other procedures for maintaining a healthy tree.
1408066 tree implants large holes created in injections or implants may create cankered areas and may keep the wounds from closing.
1408041 Compartmentalization Of Decay In Trees (CODIT) These sections came from a maple tree that was wounded experimentally. A wide variety of decay resulted, but all wounds showed the same type of thick callus ring. Again, callus is associated with the growth rate of the tree, not with the decay process.
1408051 Compartmentalization Of Decay In Trees (CODIT) We conducted research on wound dressings on hundreds of trees. After dissecting them, we found no difference between treated and control trees. These samples from the same white oak show no difference in callus formation.
1397027 human caused injury "lantern canker"
1397029 imbedded objects embedded object
1397031 imbedded objects
1397075 imbedded objects yard swing mount has girdled the tree
1397076 imbedded objects Swing mounted on tree
1397086 imbedded objects fence embedded in tree
3046065 human caused injury weed wacker damage to base of small tree
1408008 Compartmentalization Of Decay In Trees (CODIT) Cavities in trees start with wounds and dead branches or leaders. A cavity's diameter will be the same as that of the tree when it was wounded or when the branch or leader died. The leader on this birch tree died when the tree was the diameter of the cavity.
1397074 Eutypella canker Eutypella parasitica Eutypella canker creating a hazard in a campground
5062039 imbedded objects wire fence damage
5059028 imbedded objects swing mounted to trees
5059030 imbedded objects yard swing mounting has girdled the tree
5043002 imbedded objects tree bound with rope at crotch
5043050 imbedded objects cable around tree

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