Abstract
Shade (12–23% sunlight) applied for monthly periods between February and September to individual branches in upper whorls of 40-year-old Pseudotsugamenziesii caused increased pollen-cone (♂) and decreased seed-cone (♀) buds counted in autumn of the year of treatment. A consistent decreased count in both bud types the following year indicated treatment effects were carried over, raising the question as to when inducive events actually take place in Douglas-fir.
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