Agronomy Journal (2001) 93, 973-982

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James E. Kurle, Craig R. Grau, Edward S. Oplinger and Alemu Mengistu (2001)
Tillage, crop sequence, and cultivar effects on Sclerotinia stem rot incidence and yield in soybean
Agronomy Journal 93 (5), 973-982
Abstract: Sclerotinia stem rot (SSR), caused by Sclerotinia sclerotiorum (Lib.) de Bary, is an important soybean [Glycine max (L.) Merr.] disease in the North Central States. The effect of tillage, crop sequence, and cultivar on SSR incidence and soybean yield was evaluated in a 3-yr on-farm study conducted at Janesville, Sharon, and Waunakee, WI. In the study, arranged in a split-split-split-split plot design, main plots were tillage: moldboard (MB), chisel plow (CP), or no-till (NT); subplots were 1995 crops: corn (Zea mays L.), small grain, or soybean; sub-subplots were 1996 crops: corn, small grain, or soybean cultivar. Sub-sub-subplots were soybean cultivars planted in 1997. In 1997, SSR incidence averaged >40% at Janesville and Waunakee, and <1% at Sharon; and was lowest in NT (P < 0.001) or when the soybean cultivar S19-90 was planted (P < 0.001). Planting corn or oat (Avena sativa L.) the preceding year (1996) reduced SSR incidence in 1997 (P < 0.001). Yield was highest in NT (P < 0.001), in S19-90 (P < 0.001), and following oat (P < 0.001). Sclerotial density was affected by tillage (P < 0.001). Apothecial numbers were greatest in MB and lowest in NT. Because brown stem rot, Phialophora gregata (Allington and Chamberlain) W. Gams, and SSR developed at Janesville, there was a simple linear relationship between yield and SSR incidence (R2 = 0.35, P < 0.01) only at Waunakee. Soybean yields were greatest when S19-90 was planted in NT following corn or oat.
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Link to article at publishers website
Database assignments for author(s): James E. Kurle, Alemu Mengistu

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Sclerotinia sclerotiorum Soybean (Glycine max) U.S.A. (mid N)
Cadophora gregata Soybean (Glycine max) U.S.A. (mid N)