European Journal of Plant Pathology

, Volume 115, Issue 3, pp 271–281

Low Input No-till Cereal Production in the Pacific Northwest of the U.S.: The Challenges of Root Diseases

Review

Abstract

Direct-seeding or no-till is defined as planting directly into residue of the previous crop without tillage that mixes or stirs soil prior to planting. No-till reduces soil erosion, improves soil structure and organic matter, and reduces fuel inputs. No-till is widely used in cereal production in Australia, Canada, Argentina, and Brazil, but has not been widely adopted in Europe and the Pacific Northwest of the U.S. One of the limitations is that root diseases may increase with a reduction in tillage. This paper discusses the importance and management of take-all, Fusarium dryland foot rot, Rhizoctonia bare patch and root rot, and Pythium root rot in dryland cereal production systems, and how they are influenced by changes in tillage practices. To address this challenge, specifically with Rhizoctonia and Pythium, our research group has (1) developed classical and molecular techniques to detect and quantify Rhizoctonia and Pythium spp. from the soil to assess disease risk; (2) studied the disease dynamics of root disease during the transition from conventional to no-till; (3) developed greenhouse methods to screen germplasm for tolerance or resistance to Pythium and Rhizoctonia, and (4) using GPS and geostatistics, has examined the spatial distribution of R. solani and R. oryzae at a field scale up to 36 ha, across a number of crop rotations and years. By a combination of ecological, epidemiological, field, and laboratory studies, we hope to provide growers with a set of disease management tools to permit the economical and sustainable production of dryland cereals without degradation of the soil resource.

Keywords

Direct-seed no-till cereal cropping systems soilborne fungal pathogens of wheat and barley Pythium root rot Rhizoctonia bare patch and root rot Fusarium crown rot take-all Gaeumannomyces graminis var tritici Rhizoctonia solani  Rhizoctonia oryzae Ceratobasidium spp Fusarium culmorum Fusarium pseudograminearum Pythium spp. real-time quantitative PCR ITS sequencing spatial analysis Global Positioning System 

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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  1. 1.Root Disease and Biological Control Research UnitUnited States Department of Agriculture, Agricultural Research ServicePullmanUSA

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