Pear Scab Influenced by Sprinkler Irrigation Above the Tree or at Ground Level. David Sugar, Southern Oregon Experiment Station, Medford 97502. Porter B. Lombard, Southern Oregon Experiment Station, Medford 97502. Plant Dis. 65:980. Accepted for publication 25 November 1980. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-980.

The incidence of pear scab, caused by Venturia pirina, was monitored in a high-density orchard of Bartlett and Anjou pear trees. Replicated plots were irrigated by sprinkers above the trees or at ground level. Infection nearly doubled between 1 June and harvest in late August in plots irrigated from sprinklers above the trees but did not increase significantly in plots irrigated at ground level.