《Table 5–Pearson correlation coefficients between plant height, Aphanomyces root rot severity, root

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《Evaluation of host resistance and fungicide application as tools for the management of root rot of field pea caused by Aphanomyces euteiches》

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Field experiments were established on June 15，2015 and May17，2016 at two sites at Edmonton and on May 11，2016 at one site at Morden to evaluate the efficacy of five seed-treatment fungicide formulations:Apron Advance（thiabendazole+fludioxonil+metalaxyl）+Vibrance（difenoconazole+metalaxyl-M+sedaxane），INTEGO Solo（ethaboxam），BAS516F（boscalid+pyraclostrobin），BAS 720F（metalaxyl+pyraclostrobin+fluxapyroxad）and BAS 516F+BAS 720F（1:3）.The experiments were arranged in a one-factor RCBD with four replications.The seed treatments were applied uniformly to pea seeds of the susceptible‘Horizon’at the manufacturers'recommended rates（Table 1）.In Edmonton，two fungicide-free controls also were planted in A.euteichesnon-inoculated and A.euteiches-inoculated plots.Eighty seeds were sown at a depth of 5 cm along with 150 mL sand–oat inoculum（350 CFU mL-1）per 6-m row spaced 40 cm apart（2.1×105CFU plot-1）.At Morden，seeds treated with the five fungicides and one fungicide-free control were sown in a field naturally infested with A.euteiches.The four row plots were trimmed to 5 m in length with 0.6 m spacing between the rows.Emergence，root rot severity，vigor，and nodulation rates were recorded as in the inoculum density experiment.The pea plants in each field plot were hand-harvested on September 29，2015 and September 7，2016 at Edmonton and on August 15，2016 at Morden.After drying，the material from each plot was threshed with a small-plot combine.The seeds were cleaned with a Clipper seed cleaner（A.T.Ferrell Co.，Bluffton，IN，USA）and weighed to determine yield.