Abstract
AbstractDensities of pseudothecia on Douglas‐fir needles infected with Phaeocryptopus gaeumanni and needle retention on Christmas trees were related to male and female parentage in a 4 by 5 factorial mating in replicated plantings in western Oregon. Interactions of families by plantation and of male parentage by plantation were highly significant. The additive proportion of variation calculated from variance components due to male and female parentage was greater than 1.00; hence, no evidence was found of nonadditive genetic variance.
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