Journal article
Reduction of Rhizoctonia Bare Patch in Wheat with Barley Rotations
Plant disease, Vol.90(3), pp.302-306
03/2006
Handle:
https://hdl.handle.net/2376/116776
PMID: 30786553
Abstract
Rhizoctonia bare patch caused by Rhizoctonia solani AG-8 is a major fungal root disease in no-till cropping systems. In an 8-year experiment comparing various dryland no-till cropping systems near Ritzville, WA, Rhizoctonia bare patch first appeared in year 3 and continued unabated through year 8. Crop rotation had no effect on bare patch during the first 5 years. However, from years 6 to 8, both soft white and hard white classes of spring wheat (Triticum aestivum L.) grown in a 2-year rotation with spring barley (Hordeum vulgare L.) had an average of only 7% of total land area with bare patches compared with 15% in continuous annual soft white wheat or hard white wheat (i.e., monoculture wheat). In years 6 to 8, average grain yield of both soft white wheat and hard white wheat were greater (P < 0.001) when grown in rotation with barley than in monoculture. Although both classes of wheat had less bare patch area and greater grain yield when grown in rotation with barley, monoculture hard white wheat was more severely affected by Rhizoctonia than soft white wheat. Soil water levels were higher in bare patches, indicating that roots of healthy cereals did not grow into or underneath bare patch areas. This is the first documentation of suppression of Rhizoctonia bare patch disease in low-disturbance no-till systems with rotation of cereal crops.
The percent area of patches of wheat plants stunted by Rhizoctonia solani AG8 in a long-term dryland no-till cropping systems study in Washington state was significantly reduced during years 6 through 8 when spring wheat followed a year of barley (2-year rotation) compared with a monoculture of continuous annual spring wheat. This is an unusual phenomenon because barley also is highly susceptible to Rhizoctonia spp., indicating a possible microbial-mediated suppression. In addition to less bare patch area, both soft white and hard white classes of wheat had greater grain yield when grown in rotation with barley. Monoculture hard white wheat was more severely affected by Rhizoctonia spp. than soft white wheat. This is the first documentation of Rhizoctonia bare patch disease suppression with rotation of cereal crops in no-till cropping systems.
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Details
- Title
- Reduction of Rhizoctonia Bare Patch in Wheat with Barley Rotations
- Creators
- W. F Schillinger - Department of Crop and Soil Sciences, Washington State University, Dryland Research Station, P.O. Box B, Lind 99341T. C Paulitz - Root Disease and Biological Control Unit, United States Department of Agriculture Agricultural Research Service, Washington State University, Pullman 99164-6430
- Publication Details
- Plant disease, Vol.90(3), pp.302-306
- Academic Unit
- Plant Pathology, Department of; Crop and Soil Sciences, Department of
- Identifiers
- 99900547659301842
- Language
- English
- Resource Type
- Journal article