Seasonal recovery of chlorotic needles in Scotch pine

Jerry K. Jones; Jerry K. Jones

Treesearch

Seasonal recovery of chlorotic needles in Scotch pine

Informally Refereed

Authors:

Jerry K. Jones, Jerry K. Jones

Year:

1971

Type:

Research Paper

Station:

Northern Research Station

Source:

Res. Pap. NE-184. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 9 p.

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Download (PDF 329 KB): https://research.fs.usda.gov/download/treesearch/23793.pdf

Abstract

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.

Citation

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.