Reference Report for SoyBase101011032
| Title: | Tillage, crop sequence, and cultivar effects on Sclerotinia stem rot incidence and yield in soybean |
| Authors: | Kurle, J.E., Gran, C.R., Oplinger, E.S., Mengistu, A. |
| Source: | Agron. J. 2001, 93(5):973-982 |
| Abstract: | Sclerotinia stem rot (SSR), caused by S. sclerotiorum, is an important soyabean (Glycine max) disease in the North Central States of the USA. The effect of tillage, crop sequence and soyabean cultivar on SSR incidence and soyabean yield was evaluated in a 3-year on-farm study conducted at Janesville, Sharon, and Waunakee, Wisconsin, USA. In the study, arranged in a split-split-split-split plot design, main plots were tillage: mouldboard (MB), chisel plough (CP), or no-till (NT); subplots were 1995 crops: maize (Zea mays), small grains (oat cv. Dane at Janesville and Waunakee; barley cv. Chilton at Sharon), or soyabean (cv. Sturdy); sub-subplots were 1996 crops: maize, small grains, or soyabean (one of the 3 cultivars Sturdy, S19-90 or BSR101); and sub-sub-subplots were the 3 soyabean cultivars planted in 1997. In 1997, SSR incidence averaged >40% at Janesville and Waunakee, and <1% at Sharon; it was lowest under NT (P<0.001) or when the soyabean cultivar S19-90 was planted (P<0.001). Planting maize or oat (Avena sativa) the preceding year (1996) reduced SSR incidence in 1997 (P<0.001). Yield was highest under NT (P<0.001), with S19-90 (P<0.001), and following oat (P<0.001). Sclerotial density was affected by tillage (P<0.001). Apothecial numbers were greatest under MB and lowest under NT. Because brown stem rot, Phialophora gregata, and SST developed at Janesville, there was a simple linear relationship between yield and SSR incidence (R2=0.35, P<0.01) only at Waunakee. Soyabean yields were greatest when S19-90 was planted under NT following maize or oat. |
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