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United States Department of Agriculture

Agricultural Research Service

Title: Development of Eyespot on Winter Wheat in the Uk: Infection and Lesion Development on Stems in Relation to Thermal Time

Authors
item Bock, Clive
item Wan, A. - ROTHAMSTED RESEARCH
item Fitt, B. D. - ROTHAMSTED RESEARCH
item Jenkyn, J. - ROTHAMSTED RESEARCH
item Harvey, J. L. - ROTHAMSTED RESEARCH
item Goulds, A. - ROTHAMSTED RESEARCH

Submitted to: Phytopathology
Publication Type: Proceedings
Publication Acceptance Date: March 14, 2003
Publication Date: June 1, 2003
Citation: Bock, C.H., Wan, A., Fitt, B.L., Jenkyn, J., Harvey, J., Goulds, A. 2003. Development of eyespot on winter wheat in the uk: infection and lesion development on stems in relation to thermal time. Phytopathology. 93:S10.

Technical Abstract: Stem damage on winter wheat due to the eyespot pathogens (Tapesia yallundae, TY and T. acuformis, TA) causes yield loss in some locations and years in the UK. The timing and development of stem infection for each species is not fully characterized. Using data from field experiments at Rothamsted, England (1986/87, 1987/88) thermal time (accumulated degree-days) was related to the progress of TY and TA on stems. In both years the severity of stem lesions was positively correlated with thermal time. In 1986/87 there was no significant difference in severity between TY and TA. In both seasons the predominant species isolated was initially TY but TA became predominant later in the season, indicating that TY had infected the stem earlier. A controlled environment experiment showed no difference between stem incidence or severity of lesions between TY and TA when stems were inoculated directly. Thus TY may infect stem earlier than TA, indicating events in the leaf sheaths (or leaf sheath/stem interface), such as time of infection or growth rate may differ between TY and TA.

Last Modified: 12/21/2014
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