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Relationship of Environmental Stress and Cytospora chrysosperma Infection to Spring Dieback of Poplar Shoots

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Moisture content of poplar shoots in relation to their viability was investigated from January through April 1978 in eastern Inner-Mongolia. No injurious winter desiccation was found. Irreversible injury induced by solar radiation and subsequent infection by Cytospora chrysosperma was, however, observed in early spring. Only 1-year-old plants with late growth or extended growth in the fall were susceptible to the injury. Symptoms were successfully reproduced under controlled conditions. The relationship between the environmental stress and the secondary infection by Cytospora is discussed. Forest Sci. 30:645-651.
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Keywords: Heat and freezing resistance; Populus; canker; deacclimation; fungus; predisposition

Document Type: Journal Article

Affiliations: Plant Pathologist, USDA-FS, North Central Forest Experiment Station, St. Paul, MN 55108

Publication date: 01 September 1984

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