VIEW ARTICLE

Disease Control and Pest Management

Suppression of the Apple Collar Rot Pathogen in Composted Hardwood Bark. D. E. Spring, Graduate research associate, Department of Plant Pathology, Ohio Agricultural Research and Development Center, Wooster, and The Ohio State University, Columbus; M. A. Ellis(2), R. A. Spotts(3), H. A. J. Hoitink(4), and A. F. Schmitthenner(5). (2)(3)(4)(5)Assistant professor, and professors, respectively, Department of Plant Pathology, Ohio Agricultural Research and Development Center, Wooster, and The Ohio State University, Columbus, (3)Present address: Oregon State University, Mid-Columbia Experiment Station, 3005 Experiment Station Drive, Hood River 97031. Phytopathology 70:1209-1212. Accepted for publication 12 June 1980. Copyright 1980 The American Phytopathological Society. DOI: 10.1094/Phyto-70-1209.

Percentage kill of 3-wk-old apple seedlings was significantly lower in bark compost container medium than in a peat medium after inoculation with varying concentrations of Phytophthora cactorum zoospores and oospores. Sporangium production and zoospore viability was significantly lower in aqueous leachates from bark compost than in leachates from peat.