Microclimatic conditions associated with Douglas-fir needle-tip die-back were investigated in two container greenhouses operated by Canadian International Paper Inc. in Saanichton B.C. Emphasis was on maximum soil temperature in different types of growing media. The effects on soil temperature of two kinds of grit cover were also examined. The lack of significant levels of needle-tip die-back prevented any direct associations to be made between microclimate and the disease. However, the soil temperature environment was described and a relationship between ambient and soil temperature was determined.
FRDA Research Report 035 (2769 KB)
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Updated July 24, 2015