Submitted to: Fungicide and Nematocide Tests
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/13/2005
Publication Date: 4/1/2005
Citation: Strausbaugh, C.A., Koehn, A.C. 2005. Seed treatments for control of root rots in spring wheat in Bonneville County, ID, 2004. Fungicide and Nematode Tests. 60:ST002. Available: http:/www.apsnet.org/online. Interpretive Summary: Small grain cereals are produced in both direct-seeded dryland (rain-fed) and irrigated tillage-based production systems in the southeastern Idaho area of the Intermountain West (IMW). In an effort to reduce soil and wind erosion and keep production inputs at a minimum, growers in dryland production areas of the IMW have been presented with the option of adopting long-term annual cropping using direct-seeded spring cereals. Currently, about 10% of cereals in the U.S.A. and 6% in the Pacific Northwest (PNW) are direct seeded. However, in direct-seeded cropping systems in the IMW both crop rotations and host resistance are limited. Therefore cereal root disease problems are controlled primarily through the use of seed treatments. In an effort to identify seed treatments with acceptable efficacy, we evaluated 12 seed treatments and untreated check for control of root rots on spring wheat utilizing natural field infection. Disease pressure from Fusarium spp. and Bipolaris sorokiniana was observed on wheat roots in the trial. However, there were no significant differences between treatments based on the parameters assessed.
Technical Abstract: Seed treatments for the control of root rots in direct seeded spring wheat were evaluated in a commercial dryland field in Bonneville County, ID. Twelve seed treatments applied as a slurry and an untreated check were evaluated for control of root rots utilizing natural field infection and the cultivar IDO 377S. Experimental units were arranged in a randomized complete block design with four replications. Disease pressure from Fusarium spp. and Bipolaris sorokiniana was slight to moderate on the wheat roots. Plots were evaluated for stand, disease incidence and severity, yield, and test weight. There were no significant differences between treatments based on parameters assessed. No phytotoxicity was observed.