Abstract
A study was conducted in north-central Alberta to examine the effects of dwarf mistletoe on the reproductive biology of jack pine trees with severe, moderate, light and no infection. Fifty cones were collected from each of six trees in each infection class and from three non-infected trees. Cone counts were 401, 547, 787 and 1217 respectively for the four levels of infection. Total seeds per cone were 17.4, 16.3, 27.9 and 25.7. Filled seeds per cone were 13.0, 10.4, 19.9 and 18.9. Numbers of expected germinants per tree were, correspondingly 4442, 3871, 11827 and 18753. These results could be important for managers depending on natural regeneration to produce fully stocked stands following clear-cutting of infected trees. Key words: dwarf mistletoe, germinants, infection level, Jack pine, regeneration
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