TY - JOUR T1 - Duration of Water Stress Affects Development of Sphaeropsis Canker on Scots Pine JF - Arboriculture & Urban Forestry (AUF) JO - JOA SP - 73 LP - 76 DO - 10.48044/jauf.1997.009 VL - 23 IS - 2 AU - Janelle W. Johnson AU - Mark L. Gleason AU - Sharon K. Parker AU - Ellen B. Provin AU - Jeffery K. Iles AU - Paula H. Flynn Y1 - 1997/03/01 UR - http://auf.isa-arbor.com/content/23/2/73.abstract N2 - Saplings of Pinus sylvestris were subjected to drought stress periods and inoculated with Sphaeropsis 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. ER -