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What To Do With Pine Needles. Pine needles are a scourge to many gardeners. While leaves that have fallen from trees can be easily raked up, blown away, or crushed underfoot, pine needles lie in ever-growing mats on the ground and are more difficult to remove.
Inside the tree, they feed on the cambium, which is where water and food-carrying structures of the tree are produced. If the cambium is destroyed, branches or the entire tree will die. Leaves of dogwoods infested with the dogwood borer will often turn red and drop early. Bark sloughs off around holes on the trunk or branches. In late summer, a brown sawdust-likeborer frass (insect waste) may be seen near or below the holes.