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Sensitivity of Mycosphaerella pinodes to pyraclostrobin and optimizing fungicide application in field pea Open Access


Other title
field pea
Mycosphaerella pinodes
fungicide insensitivity
sprayer technology
Type of item
Degree grantor
University of Alberta
Author or creator
Bowness, Robyne T.
Supervisor and department
Strelkov, Stephen (Department of Agricultural, Food and Nutritional Science)
Examining committee member and department
Hall, Linda (Department of Agricultural, Food and Nutritional Science)
Yang, Rong-Cai (Department of Agricultural, Food and Nutritional Science)
Gossen, Bruce (University of Saskatchewan)
Department of Agricultural, Food, and Nutritional Science
Plant Science
Date accepted
Graduation date
Master of Science
Degree level
Mycosphaerella pinodes caused by mycosphaerella blight, a destructive disease of field pea is primarily managed with foliar fungicides. Development of fungicide insensitivity in M. pinodes could severely reduce management options. The objectives of this study were to assess insensitivity to pyraclostrobin fungicide in M. pinodes populations from western Canada and the U.S.A., and to determine the optimum fungicide delivery system to manage mycosphaerella blight. Over 300 M. pinodes isolates collected in 2010-11 were tested for insensitivity and 19 isolates were found to be insensitive to the fungicide, suggesting the need for judicious use of pyraclostrobin. Sprayer technology trials under field conditions revealed that double nozzles and water volumes up to 400 L ha-1 improved fungicide efficacy relative to control treatments. Above 400 L ha-1, disease was higher and yield was lower in all trials, suggesting that higher volumes can over-saturate the leaves and cause fungicide run-off.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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