|HARVEY, J. L.|
Submitted to: Phytopathology
Publication Type: Proceedings
Publication Acceptance Date: 3/14/2003
Publication Date: 6/1/2003
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: penetration and infection of leaf sheaths in relation to thermal time. Phytopathology. 93:S88.
Technical Abstract: Eyespot (Tapesia yallundae, TY and T. acuformis, TA) of winter wheat causes yield loss in some locations and years in the UK. Disease progress for each species is not fully understood. The development of TY and TA on leaf sheaths was related to thermal time (accumulated degree-days) in five field experiments at Rothamsted, England (1985/86, 1986/87, 1987/88 and two in 2000/01). Depending on cultivar, season and sample the mean number of living leaves infected was 1.0 - 2.0 and 1.0 - 2.7 leaves per plant for TY and TA, respectively. The cumulative number of leaf sheaths penetrated or infected was consistently and positively correlated to thermal time from sowing date, with no significant differences in infection or penetration rates between TY and TA. Inoculation of wheat plants under controlled environment conditions with TY and TA showed no difference in number of leaf sheaths infected (3.43 and 2.99 leaf sheaths infected, respectively, at 106 conidia ml-1. Although differences in progress of disease may exist between TY and TA, it was not discernable under the experimental conditions here.