Abstract
Several fungicide treatments are available for control of leaf rust and Septoria leaf blotch of wheat. The objectives of this study were to compare fungicide treatments across environments (location-years) for effects on leaf rust and leaf blotch control, yield and test weight, and to partition the total variability into components associated with environment, environment × treatment interaction and experimental error. Eight treatments were evaluated on three wheat cultivars across four environments. Tebuconazole applied at flag leaf emergence and propiconazole applied at flag leaf emergence followed by triadimefon plus mancozeb at heading were consistently among the treatments with the lowest disease severities and highest yields and test weights. Efficacy of full or half rates of propiconazole applied at flag leaf emergence or triadimefon plus mancozeb applied at heading were not significantly different. Most of the variability for yield was due to environment, and little was due to environment × treatment interaction, indicating that the ranking of treatments did not differ across environments. The proportion of variability due to environment × treatment interaction was higher for test weight and disease severity than for yield. Because of economic considerations, only one fungicide application is feasible. Extending the application time for propiconazole beyond flag leaf emergence or registering tebuconazole for use on wheat probably would be a benefit to growers.
Published Version
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