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New Zealand Plant Protection 68 (2015): 166-172

Wheat take-all: lessons learned during a search for effective biological control

D. Bienkowski, E.E. Hicks and M. Braithwaite


Take-all (causal agent Gaeumannomyces graminis var. tritici) is one of the most important soil-borne diseases of wheat. Greenhouse screening of microorganisms for disease suppression was conducted, using a targeted approach that focused on the fungal genus Trichoderma. In spite of indications of disease suppression in preliminary assays, effective biocontrol was not observed in subsequent tests. Explanations for this apparent loss of disease suppression could include insufficient numbers of potential biocontrol agents screened during the selection process or the issue of false-positive (type 1 error) results.

Keywords: take-all, Trichoderma, consistency, screening.

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