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Effect of stem rust fungi on 45 year old jack pine pinus banksiana


Effect of stem rust fungi on 45 year old jack pine pinus banksiana



Plant Disease 67(1): 26-28



ISSN/ISBN: 0191-2917

A plantation of jack pine (P. banksiana) surveyed for stem rust infections in 1958 when 25-yr old had 34% of the trees with sweetfern rust (Cronartium comptoniae) infections on the main stem. In 1978 this stand was sampled again, and 49% of the trees had sweetfern rust cankers on the main stem. A significant number of sweetfern rust cankers were not visible until 1978. Cross sections through a sample of these latent cankers indicated that the infections had been present since the trees were very young. Diameter of infected trees at 1.4 m was reduced with increased stem circumference affected by the sweetfern rust. Trees with pine-oak rust (C. quercuum) infections had slightly higher mortality and slightly smaller diameters than rustfree trees. The incidence of decay was low in 25 sampled trees.

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Accession: 005272478

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