New Information about Take-All Decline and Its Relevance to Research on the Control of Take-All by Biological Control Agents

  • David Hornby
Part of the NATO ASI Series book series (NSSA, volume 230)


Those working on biological control agents (BCAs) regard the phenomenon of take-all decline (TAD) as a natural model for biological control of take-all of wheat, caused by Gaeumannomyces graminis var. tritici (Thomashow and Weller, 1990). There is still much that is not known about TAD, so the extent to which current BCAs simulate the mechanisms of TAD is debatable; but if they do, the findings reported here have implications for a) interpretation of work based on seedling-infection tests, b) the limits within which BCAs might be expected to operate effectively and c) the development of realistic and adequate tests for BCAs.


Winter Wheat Biological Control Agent Wheat Crop Disease Suppression Disease Progress Curve 
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Literature Cited

  1. Hornby, D., 1979, Take-all decline: a theorist’s paradise, in: “Soil-borne Plant Pathogens”, B. Schippe’rs and W. Gams, eds., Academic Press, London.Google Scholar
  2. Hornby, D., and Bateman, G. L., 1990, Artificial infestation of soil with Gaeumannomyces graminis var. tritici to study the relationship between take-all and wheat yields in field experiments, Soil Use and Management, 6: 209.CrossRefGoogle Scholar
  3. Hornby, D., Bateman, G. L., Payne, R. W., Brown, M. E., and Henden, D. R., 1989, An experimental design and procedures for testing putative controls against naturally-occurring take-all in the field, Ann. Appl. Biol., 115: 195.CrossRefGoogle Scholar
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  5. Werker, A. R., Gilligan, C. A., and Hornby, D., 1991, Analysis of disease-progress curves for take-all in consecutive crops of winter wheat, Plant Pathol., 40: 8.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • David Hornby
    • 1
  1. 1.Institute of Arable Crops ResearchRothamsted Experimental StationHarpenden, HertsUK

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