Infection Period ofPhaeocryptopus gaeumanniion Douglas-Fir Needles in Western Washington

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Abstract
Swiss needle cast is a major disease of Douglas-fir grown as Christmas trees in western Washington and Oregon. To determine when needles are infected by P. gaeumannii in western Washington, trees were introduced or removed from a spray program using known effective fungicides. Spray applications were made monthly during a 52-wk period during 1980-1981. Single applications were made weekly May-July in 1981. Needles were infected shortly after budbreak and single applications of chlorothalonil provided effective disease control if applied during shoot elongation in early spring.

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