Influence de stress contrôlés sur la sensibilité du bouleau jaune au chancre godronien causé par Godroniacassandrae Peck f.sp. betulicola Groves

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Abstract
Water-, nutrient-, or cold-stressed yellow birch seedlings showed an increased susceptibility to Godroniacassandrae Peck f.sp. betulicola Groves only when inoculation took place at the end of the growing season or during the dormant season. The effect of water stress was related to an observed decrease in plant water potential. Nitrogen deficiency increased susceptibility and markedly reduced growth both in diameter and height. However, a phophorus deficiency did not affect the disease or diameter growth, although height growth was slightly reduced. Increased susceptibility caused by cold stresses was proportional to the intensity of the stress. Susceptibility of younger shoots was not increased as much as that of older ones. Results show that G. cassandrae is weakly aggressive on yellow birch, attacking only weakened plants or dying twigs on healthy trees.

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