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Tell me again what it is that you do.

R James Cook1

  • 1Washington State University, Pullman, Washington 99164-6430, USA. rjcook@wsu.edu

Annual Review of Phytopathology
|March 16, 2007
PubMed
Summary
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Beneficial soil bacteria help manage wheat and barley root diseases in no-till farming. These microbes suppress take-all and other pathogens, improving crop health in direct-seed systems.

Area of Science:

  • Agricultural Science
  • Plant Pathology
  • Soil Microbiology

Background:

  • Agronomic strategies were developed to control wheat and barley root diseases, including Fusarium, take-all, Pythium, and Rhizoctonia, starting in 1965.
  • Initial approaches focused on cereal-based cropping systems, evolving towards cereal-intensive direct-seed (no-till) systems by the late 1970s.

Observation:

  • The decline of take-all disease in monoculture wheat or barley-wheat sequences was linked to indigenous antibiotic-producing fluorescent pseudomonads.
  • These beneficial rhizobacteria play a crucial role in disease suppression within agricultural soils.

Findings:

  • A team effort identified antibiotic-producing fluorescent pseudomonads as key agents in managing take-all disease.
  • These beneficial rhizobacteria are central to an integrated system that enhances take-all decline.

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Implications:

  • The integrated system effectively limits Pythium, Rhizoctonia, and Fusarium root and crown rots in direct-seed systems.
  • This approach redefines 'crop rotation' in no-till systems, utilizing diverse cereal varieties and market classes to manage multiple root diseases.