Effect of Row Width on Spray Penetration, Spur Blight Incidence, and Yield of Heritage Red Raspberry. M. A. Ellis, Assistant Professor, Department of Plant Pathology, Ohio Agricultural Research and Development Center, Wooster 44691 and The Ohio State University, Columbus 43210. R. N. Williams, Associate Professor, and H. R. Krueger, Professor, Department of Entomology, Ohio Agricultural Research and Development Center, Wooster 44691 and The Ohio State University, Columbus 43210. Plant Dis. 66:920-922. Accepted for publication 1 February 1982. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-920.

Rows of Heritage red raspberry were adjusted to widths of 46, 91, and 137 cm (18, 36, and 54 in., respectively). Spray deposition in the row centers significantly decreased and canker length significantly increased with each increase in row depth. Canker length was significantly greater in the 46- and 91-cm rows on unsprayed canes than on canes sprayed with fungicide in the same row width. There were no significant differences in canker length on sprayed and unsprayed canes in the 137-cm row. Number of cankers per cane was significantly less on sprayed canes in 46-cm rows than any other treatment. There were no significant differences in canker number on unsprayed canes in the 46-cm row and sprayed or unsprayed in the 91- and 137-cm rows. Total yield was significantly greater from sprayed than from unsprayed canes in the 46- and 91-cm rows. There were no significant differences in yield between sprayed canes in the 46- and 91-cm rows or between sprayed and unsprayed canes in the 137-cm row.

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