Transmission and Control of Pythium aphanidermatum in an Ebb-and-Flow Subirrigation System. S. Sanogo, Graduate Student, Department of Plant Pathology, The Pennsylvania State University, University Park 16802. G. W. Moorman, Associate Professor, Department of Plant Pathology, The Pennsylvania State University, University Park 16802. Plant Dis. 77:287-290. Accepted for publication 6 November 1992. Copyright 1993 The American Phytopathological Society. DOI: 10.1094/PD-77-0287.

Pythium aphanidermatum was consistently transmitted to healthy potted cucumber (Cucumis sativus ‘County Fair’) plants grown in an ebb-and-flow subirrigation system when the irrigation solution was artificially infested. In contrast, transfer of the fungus was low and sporadic when some plants growing in infested medium were placed in the system among plants growing in noninfested medium. Metalaxyl was more effective than etridiazole in controlling Pythium infection when granular formulations were incorporated into the growing medium.