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Field studies were conducted in 1999 and 2001 in western Oregon to determine the effect of between-row spacing on severity of white mold (Sclerotinia sclerotiorum) in snap beans. Planting density was held constant at 445,000 plants ha -1 and between-row spacing ranged from 19 to 150 cm. Disease severity and pod rot were greatest in both years of study at the 19-cm between-row spacing and declined linearly as between-row widths increased. Severity of disease in 1999 was 24%, 41%, and 88% lower at the 38-, 75-, and 150-cm between-row spacings, respectively, than at the 19-cm row spacing. In 2001, disease severity was 11%, 25%, 34%, and 51% less at the between-row widths of 38, 75, 114, and 150 cm, respectively, than at the 19-cm row spacing. Incidence of pod rot declined by 0.24% and 0.64% for each 10-cm increase in between-row width in 1999 and 2001, respectively. The fungicide vinclozolin effectively suppressed pod rot in both years at all between-row spacings. Pod yield was not influenced by between-row spacings of 19 to 114 cm, but yield was significantly lower at the between-row spacings of 150 cm. Increasing the between-row width of snap bean rows may be an effective disease management tactic to suppress white mold when fungicides are not applied or if efficacious fungicides are not available.

Modification of Plant Arrangement Suppresses White Mold of Snap Beans