Duration of Water Stress Affects Development of Sphaeropsis Canker on Scots Pine    (View PDF)

Janelle W. Johnson, Mark L. Gleason, Sharon K. Parker, Ellen B. Provin, Jeffery K. lies, and Paula H. Flynn.

Abstract: Saplings of Pinus sylvestris were subjected to drought stress periods and inoculated with Sphaempsis sapinea in a greenhouse experiment. Six wk after inoculation, saplings that had low needle water potentials for 14 to 21 days after inoculation exhibited more dieback and developed significantly (P < 0.05) longer cankers than saplings that had equivalent water stress for 3 to 4 days after inoculation or unstressed saplings. The results indicate that drought stress increases susceptibility of Scots pine to Sphaeropsis canker and that canker growth can be suppressed by watering drought-stressed trees.

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https://doi.org/10.48044/jauf.1997.009