Composted Hardwood Bark: A Substitute for Steam Sterilization and Fungicide Drenches for Control of Poinsettia Crown and Root Rot1

in HortScience
Authors:
G. C. DaftOhio Agricultural Research and Development Center Wooster, OH 44691

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H. A. PooleOhio Agricultural Research and Development Center Wooster, OH 44691

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H. A. J. HoitinkOhio Agricultural Research and Development Center Wooster, OH 44691

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Abstract

Rhizoctonia and Pythium crown and root rot of Euphorbia pulcherrima willd ex Kotzch cv. Annette Hegg Dark Red were suppressed in a composted hardwood bark medium amended with sphagnum peat. The suppression equalled that obtained in an aerated steam-treated peat medium drenched with fungicidies. Growth of ‘Annette Hegg Dark Red’ produced in the sphagnum peat-amended bark was improved over plants produced in a sterilized and fungicide drenched soil-peat-perlite medium. Addition of muck to composted hardwood bark negated the desirable growth effects.

Contributor Notes

Received for publication October 11, 1978. Approved for publication as Journal Article No. 142-78 of the Ohio Agricultural Research and Development Center, Wooster, OH. Supported in part by grants from The Operations Division, Office of Pesticide Programs, United States Environmental Protection Agency, The Fred C. Gloeckner Foundation, Inc., 15 East 26th Street, New York, NY 10010 and Mead Paygro, Mead World Headquarters, Court House Plaza Northeast, Dayton, OH 45402.

The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.

Former Post-doctorate, Department of Plant Pathology; Assistant Professor, Department of Horticulture; and Professor, Department of Plant Pathology, respectively; Ohio Agricultural Research and Development Center.

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