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Vertical Distribution and Survival of Sclerotium oryzae Under Various Tillage Methods. R. K. Webster, Department of Plant Pathology, University of California, Davis 95616; J. Bolstad(2), C. M. Wick(3), and D. H. Hall(4). (2)(3)(4)Agricultural Extension Service, Butte County and Davis, California. Phytopathology 66:97-101. Accepted for publication 16 July 1975. DOI: 10.1094/Phyto-66-97.

The effects of various residue management practices were examined on vertical distribution, survival, and availability of sclerotia of Sclerotium oryzae under continuous rice culture. Open field-burning of residue was the most effective method for minimizing inoculum levels. When residue was incorporated into soil, moldboard plowing resulted in burying a high percentage of the surviving inoculum, rendering it unavailable for infection of water-sown rice. A differential survival of sclerotia at various soil depths was observed between tillage methods compared.

Additional keywords: stem rot of rice, cultural control.