Converting Rhododendron-Laurel Thickets to White Pine with Picloram and Mycorrhizae-Inoculated Seedlings

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Abstract:

A ridge site in the Appalachian highlands of North Carolina was prepared for planting container-grown white pine (Pinus strobus L.) seedlings by treatment with herbicide. A pellet formulation of picloram (4-amino-3,5,6-trichloropicolinic acid) containing 10% acid equivalent was applied in May 1978. Control of rhododendron (Rhododendron maximum L.), laurel (Kalmia latifolia L.), and other hardwood vegetation was sufficient to allow pine establishment. White pine survival was 96% 18 months after planting. Inoculation of seedlings while still in the greenhouse with the mycorrhizal fungus Pisolithus tinctorius (Pers.) Coker and Couch did not significantly affect seedling survival, total height, seasonal height growth, or basal diameter in the field. Height growth the second growing season after planting 6-month, container-grown stock averaged 5.1 to 7.5 inches. Eighteen months after planting, total seedling height averaged 13.3 inches, with the tallest exceeding 29.1 inches. Both height and diameter growth of white pine seedlings were inversely related to the degree of shading from remaining vegetation.

Document Type: Journal Article

Affiliations: Silviculturist (retired), Region 8 Timber Management, USDA Forest Service, Atlanta, Ga.

Publication date: August 1, 1984

More about this publication?
  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Southern Journal of Applied Forestry covers an area from Virginia and Kentucky south to as far west as Oklahoma and east Texas.
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