. Annual report, 1954. Forests and forestry Southern States Periodicals; Forests and forestry Research Southern States Periodicals. Figure 24. --Turpentining in this 20-year-old plantation of slash pine reduced annual volume growth of a 16-foot section of the tree by 26 percent. Circumference measure- ments were made bimonthly with the aid of vernier growth bands installed at three heights on the bole of each tree in the study. Effect of Turpentining on Growth For two successive years, the annual growth increment in the first 16-foot log of 20-year-old slash pine trees (fig. 24) has been reduc
. Annual report, 1954. Forests and forestry Southern States Periodicals; Forests and forestry Research Southern States Periodicals. Figure 24. --Turpentining in this 20-year-old plantation of slash pine reduced annual volume growth of a 16-foot section of the tree by 26 percent. Circumference measure- ments were made bimonthly with the aid of vernier growth bands installed at three heights on the bole of each tree in the study. Effect of Turpentining on Growth For two successive years, the annual growth increment in the first 16-foot log of 20-year-old slash pine trees (fig. 24) has been reduced 26 percent by tur- pentining with either the bark chipping or wood chipping method. The reduction in growth is greatest immediately above the turpentine face and becomes less with increasing height above the ground as shown in figure 25. The change in the amount of the reduction with increasing height is slight and for practical purposes can be ignored. The value of the potential pulpwood increment lost by turpentining an average tree 10 inches in diameter is less than 2 cents per year at current stumpage prices. The lease value of a turpentine face on such a tree is about 10 cents per year. Hence, turpentining leaves a large margin for profit even after deducting the value of the lost wood increment. Effect of Black Turpentine Beetle Control Measures on Gum Yields Some degree of control of black turpentine beetles has been obtained with a basal spray of 1-percent solution of benzene hexachloride in tests made by the Division of Forest Insect Research. In cooperation with this division, a test was made of the effect of this treatment on gum yield. Results showed that the treatment caused a temporary reduction in gum yield that persisted for about one month. Total gum yields for one year of work, however, were only slightly affected. - 35 -. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
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