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Summary
| 1. | Cankers on older trees in forest stands of poplar are found for the most part in the upper part of the trees. Cankers on trees in the open (younger trees) are found near the base of the tree. | ||||
| 2. | For the same locality the percentage of infection in the open was 21%, in the forest stand it was somewhat lower. | ||||
| 3. | No cankers were found on P. tacamahccca Mill. | ||||