Pitch Canker Damage to South Florida Slash Pine
Observations of incidence, rate of spread, and effect on tree growth and mortality of pitch canker disease caused by Fusarium lateritium f. pini were made in pulpwood-size stands of South Florida slash pine (Pinus elliottii var. densa). Incidence increased rapidly over a 5-year period, but was not correlated with either tree crown class or diameter. Removal of all diseased trees from some plots had no effect on rate of infection of remaining trees. The disease originated more often in the leaders of young trees than in the branches. Reduced diameter growth and increased rate of mortality were observed in pitch cankered trees. When diseased trees were not killed by the canker, they were commonly malformed. Pitch cankered trees should be discriminated against during thinning but only the more seriously diseased trees should be removed if heavier thinning would result in a drastically understocked stand.
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Document Type: Journal Article
Affiliations: Chief, Division of Forest Disease Research, Southeastern Forest Expt. Sta., Forest Service, U. S. Dept. Agric., Asheville, N. C.
Publication date: 1963-07-01
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