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CEPA in Sulfuric Acid Paste Increases Oleoresin Yields

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During 2 growing seasons, slash (Pinus elliottii Engelm.) and longleaf (P. palustris Mill.)pines were worked for naval stores to test chemical additives to sulfuric acid pastes. A 53% acid paste is used commercially to stimulate oleoresin flow. Only 2-chloroethylphosphonic acid (CEPA) increased gum yields significantly. Maximum yields were obtained by lowering the sulfuric acid concentration to 25% and adding CEPA at 2.5 or 5.0%. Yields were increased up to 36% in 21- to 23-year-old slash pines (25% sulfuric acid plus 5.0% CEPA) and 65% in 60-year-old longleaf pines (25% sulfuric acid plus 2.5% CEPA). In treatments with CEPA and no sulfuric acid, yields increased with increasing CEPA concentration, but all were at least 22% less than that from the commercial paste. Near-maximum yields were obtained by spraying to runoff with 21.6% CEPA (as the full-strength commercial formulation of Ethrel®) over the smoothed bark surface.
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Document Type: Journal Article

Affiliations: Research geneticist-physiologist, Southeastern Forest Experiment Station, USDA Forest Service, Olustee, Florida 32072

Publication date: 1984-08-01

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  • 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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