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Interactions Between Foliar Sprays and Soil Fumigation In the Yield Response of Potatoes. Monty D. Harrison, Professor of Botany and Plant Pathology, Colorado State University, Fort Collins 80521; Phytopathology 64:860-864. Accepted for publication 22 January 1974. DOI: 10.1094/Phyto-64-860.

Yield increases in potatoes (Solanum tuberosum) from control (by foliar spray) of Alternaria solani were greater in fumigated than nonfumigated soils. In some instances, significant yield increases from the early blight control occurred only in fumigated plots; in others, significant yield increases over those of nonsprayed controls occurred in both nonfumigated and fumigated soils. The interaction between Verticillium wilt and early blight is suggested as a critical factor in data interpretation.

Additional keywords: Verticillium albo-atrum.