A twig- and branch-girdling canker caused considerable flagging in crowns of native and exotic pine species in the eastern United States in 1933 and 1934. The disease, although primarily of saplings, attacks all size classes. In the southeastern United States the flagging was so extensive on both planted and natural stands of slash pine that it caused many naval-stores operators to discontinue planting that species until the status of the disease, whether native or introduced, could be determined. The epidemic subsided by autumn of 1934 without causing serious damage. Old cankers of the perennial type were found in several localities, further suggesting that the disease is indigenous, or at least behaves as an indigenous disease. No control measures are recommended.
Document Type: Journal Article
Associate pathologist, Bureau of Plant Industry, U. S. Department of Agriculture, Washington, D. C.
Publication date: January 1, 1943
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