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How to Identify and Control Rhabdocline and Swiss Needlecasts of Douglas-Fir

Two needlecast fungus diseases- Rhabdocline (Rhabdocline pseudotsugae) and Swiss needlecast (Phaeocryptus gaumanni)- have become serious problems in Douglas-fir plantations across the United States, particularly in the Northeast and more recently in the Pacific Northwest. These two diseases cause premature needle loss resulting in trees with thin foliage. This condition adversely affects all Douglas-fir plantations, but is especially bad in Christmas tree plantations where thin-foliaged trees may not be salable. Both diseases seem to be more severe on the Rocky Mountain variety of Douglas-fir than on the Pacific coast variety.

PDF Download: Year of Publication:
1998
ID: 
HT-59
Author: 
Skilling, Darrell D.; Morton, Harrison L.
Availability: 
Online
Topic:
Insects and Diseases
Trees
How to Identify and Control Rhabdocline and Swiss Needlecasts of Douglas-Fir
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