. Managing the family forest. Forest management; Woodlots. 34 FARMERS' BULLETIN 2187. F-237522 A conk or fruiting body on this black walnut indicates heart rot. Cankers.—Most cankers of hardwood and softwood trees are caused by fungi. Cankers may resemble mechanical injuries at first, but they remain open and may grow larger while ordinary wounds heal. Hardwood cankers seldom kill the trees. They do deform trees, and the rot that sets in behind them often causes the tree to break at the damaged spot. Severely cankered trees should be removed whenever possible. Rusts.—Most of the important pine
. Managing the family forest. Forest management; Woodlots. 34 FARMERS' BULLETIN 2187. F-237522 A conk or fruiting body on this black walnut indicates heart rot. Cankers.—Most cankers of hardwood and softwood trees are caused by fungi. Cankers may resemble mechanical injuries at first, but they remain open and may grow larger while ordinary wounds heal. Hardwood cankers seldom kill the trees. They do deform trees, and the rot that sets in behind them often causes the tree to break at the damaged spot. Severely cankered trees should be removed whenever possible. Rusts.—Most of the important pine cankers are caused by fungi called rusts. Eusts usually produce orange blisters especially notice- able in spring. They often spend part of their lives on one kind of plant and part on another, a fact that helps in controlling some of the worst of them. White pine blister rust attacks any of the five-needled pines and has now spread through much of their range. This rust fungus spends part of its life on pine and part on the leaves of currant or gooseberry bushes. Rust spores formed on these alternate hosts spread to and infect pine in the summer and fall. Blisters develop on the pine in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mark, Gordon G. , 1910-; Dimmick, Robert S. , 1911-. Washington, D. C. : U. S. Dept. of Agriculture
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Keywords: ., bookcentury1900, bookpublisherwashi, booksubjectforestmanagement
