Biological assessment of soils for potential development of take-all root rot Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ks65hg95h

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  • Take-all root rot (Gaeumannomvces araminis var.tritici) is a major disease of wheat (Triticum aestivum) in western Oregon. Control of take-all is dependent on management practices such as crop rotation and soil fertility-plant nutrition relationships. The objective of this study was to develop a bioassay that could measure the influences of crop sequence, lime and sewage sludge applications on soil suppression of take-all. Soil was collected from six experimental field plots exhibiting different management and disease histories. Seedlings were grown in inoculated soil in a growth chamber and disease severity assessed at 35, 65, and 90 days after sowing. Inoculum efficiency and relative infection rates were determined using epidemiological techniques. Inoculum efficiency was greatest in lime and sludge amended treatments, moderate in nonlimed sludge amended treatments, and least in samples that received neither lime nor sludge. Relative infection rates of G. araminis followed a similiar trend. Second year wheat after oats was more suppressive to take-all than fifth year wheat, especially on lime-amended soils. Field observations of disease progress were made in the same plots where soil had been collected for the growth chamber bioassay. Final disease readinas and relative infection rates were greatest for the limed sludge amended treatments. Final disease readings and relative infection rates were moderate for unlimed treatments with no sewage sludge present. The lowest disease levels and infection rates were exhibited by the unlimed plots with a history of sewage sludge. In contrast to the results of the bioassay, fifth year wheat field plots overall had less severe disease than did the second year plots. The presence of sewage sludge in the unlimed field plots appeared to have an ameliorating effect
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