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Proceedings
STEM RUST CONTROL IN PERENNIAL RYEGRASS FOR SEED PRODUCTION
G.A. Gingrich and M.E. Mellbye
Department of Crop and Soil Science, 131 Crop Science Bldg.,
Oregon State University, Corvallis, OR. USA 97331-3002
Stem rust (Puccinia graminis spp. graminicola) is a serious fungal disease affecting perennial ryegrass seed production in western Oregon, USA. Fungicide trials have been conducted on commercial grass seed fields since 1993 to explore more effective fungicide materials and application options. Results of the 1997 and 1998 on-farm research trials are summarized in this paper. Fungicide applications were made to small, replicated plots at several field locations each year. Visual evaluations to determine rust infection levels were made to compare the effectiveness of the standard fungicide treatment using Tilt (propiconazole) with several new fungicides to control stem rust in perennial ryegrass seed yields. This paper reports the results of the on-farm trials comparing applications of Folicur (tebuconazole), a sterol inhibitor fungicide and Quadris (azoxystrobin) a new, broad-spectrum fungicide with the standard treatment using Tilt.
Keywords: Perennial ryegrass; stem rust; fungicide and strobilurin.