Development of Cankers Caused by Nectria cinnabarina on Honey Locusts After Root Pruning. P. J. Bedker, Graduate Research Assistant, Department of Plant Pathology, University of Minnesota, St. Paul 55108. R. A. Blanchette, Assistant Professor, Department of Plant Pathology, University of Minnesota, St. Paul 55108. Plant Dis. 67:1010-1013. Accepted for publication 19 March 1983. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-1010.

Nectria cinnabarina can cause damaging cankers on honey locusts, especially on newly transplanted trees. Root pruning was used to simulate transplanting stress on honey locusts. Trees that were root-pruned had significantly lower (P <0.05) water potentials than unpruned trees. Cankers caused by N. cinnabarina after inoculation to twigs, branches, and stems were larger on trees that were root-pruned than on unpruned trees. Uninoculated wounds closed more slowly on trees that were root-pruned than those that were not root-pruned.