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USDA Forest Service

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."


Remove Filters: Urban Forestry(X) Demonstration(X) USDA Forest Service - Northeastern Area Archive(X)

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Image Subject Name Scientific Name Description
1407022 branch union and when branches die,; showing natural branch shedding at the branch union.
1407023 branch union they, too, fall away.; showing action of natural pruning at the branch union.
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.
1408043 crown reduction (pruning) When removing a leader, slant the cut gently as shown on the left' a flat cut invited rapid decay development.
1408044 crown reduction (pruning) On the other hand, a severely slanted cut also encourages the spread of decay upward and downward.
1408025 pruning (general) Every branch has a thick bark ridge separating it from the main stem. Never cut behind the branch bark ridge. Never leave a stub, as shown here. Always cut as close as possible to the outer edge fo the branch bark ridge, as indicated by the red line.
1408026 pruning (general) The inner side of the sample shows the hard inner wood of the branch bark ridge. If you cut behind the ridge at the arrow you'll injure the main stem. Cut the branch, not the trunk, by following the red line.
1407049 pruning (general) Never prune where this saw is poised, behind the bark ridge. Cut in front of the ridge, as indicated by the red line. Never prune when the leaves are forming. As mentioned earlier, don't paint wounds except for cosmetic reasons; then use a thin coat of a commercial dessing, never a house paint

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