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Effect of seed dressing fungicide and inoculum density on Aphanomyces root rot of field pea in Alberta.

Wu, L.F., Chang, K.F., Hwang, S.F., Strelkov, S.E., Conner, R.L., Gossen, B.D., and Turnbull, G.D. 2016. Effect of seed dressing fungicide and inoculum density on Aphanomyces root rot of field pea in Alberta. Can. J. Plant Pathol. 38: 269.

Abstract

Field pea (Pisum sativum L.) is an important commercial crop in Alberta with high protein content and the ability to improve the nitrogen content in soil. Root rot caused by soil-borne pathogens is common in field pea crops in Alberta. Recently, root rot caused by Aphanomyces euteiches was reported to be a concern where above-normal spring rainfall occurred. Experiments were conducted to determine effects of seed treatment and inoculum density on Aphanomyces root rot of field pea under greenhouse and field conditions. Five seed-treatment fungicides, including Apron Advance, Intego Solo, BAS 516F, BAS 720F and BAS 516F + BAS 720F (1:3), were evaluated in 2015. All of the treatments with the exception of Apron Advance reduced root rot severity, and BAS 516F, BAS 720F and Intego Solo improved plant vigour compared with the control treatment under greenhouse conditions. Under field conditions, the treatment effects were generally not significant. In an inoculum density study, increasing inoculum density significantly reduced seedling emergence and plant vigour, and increased root rot severity under both field and greenhouse conditions. The experiments will be repeated in 2016 to confirm the results.

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