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Title: Impact of Tip Moth Injury on Growth and Yield of 16-Year-Old Loblolly and Shortleaf Pine
Author(s): Williston, H.L.; Barras, S.J.
Date: 1977
Source: Res. Note SO-221. New Orleans, LA: U.S. Department of Agriculture, Forest Service, Southern Forest Experiment Station. 5 p.
Station ID: RN-SO-221
Description: For the first six growing seasons, 47 loblolly and shortleaf pine plots throughout the South were treated to protect them against tip moth (at first with DDT and later with a granular phorate). Treatments provided good protection, and in the early years treated trees appeared to outgrow untreated trees. But by age 16 there were no substantial differences in height or diameter except at one location. Overall, treatment increased the loblolly yield 3.9 cords per acre and the shortleaf yield 0.4 cord per acre. At current stumpage prices, such an increase in yield would not provide enough economic gain to justify treatment.
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