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Title: Seasonal recovery of chlorotic needles in Scotch pine
Author: Jones, Jerry K.; Jones, Jerry K.;
Source: Res. Pap. NE-184. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 9 p.
Publication Series: Research Paper (RP)
Description: As part of a research project on Christmas trees being carried on by the USDA Forest Service's Northeastern Forest Experiment Station, the author made a cooperative study of how discolored needles recover their normal color in February and April. Though this does not solve the Christmas tree growers' problem, it does shed some light on the process involved in the discoloration. The study confirmed that the seasonal yellowing of the needles is due primarily to the loss of chlorophyll and, conversely, that a sharp increase in chlorophyll concentration accompanies the return to summer green.
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Jones, Jerry K. 1971. Seasonal recovery of chlorotic needles in Scotch pine. Res. Pap. NE-184. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 9 p.
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