The newest edition is published by the U.
S.
Most of the original Pest descriptions remain in the manual; however, given that Christmas Tree growers are growing more fir and other species, new Pest problems needed to be addressed..
The original Manual had a strong emphasis on Scotch pine.
This edition includes a number of new pests, many of them found on fir Christmas trees.
Forest Service, Northeastern Area State and Private Forestry.
The newest edition is published by the U.
S