White_mould_fungicides_for_dry_beans_Allegro-Propulse
Allegro (left) and Propulse (right) are the fungicides commonly used by dry bean growers.
Photo: Courtesy Chris Gillard, University of Guelph
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Figure 1: White mould disease severity (AUDPC1), dry bean yield (kg/ha) and return on investment ($/ha) at Huron Research Station, 2012-13. (Bars within a group (location and year) with the same letter are not significantly different (P<0.05). 1AUDPC = plant disease ratings over time is graphed, and the area of the disease curve is measured to estimate the disease progress. Higher values have greater disease severity ratings)
Photo: Courtesy Chris Gillard, University of Guelph
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The untreated check in the plot.
Photo: Courtesy Chris Gillard, University of Guelph
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An overhead photo of the plots from a drone.
Photo: Courtesy Chris Gillard, University of Guelph
Ontario growers routinely use fungicides to manage white mould in dry beans, but they should be applied before any disease is visible. The purpose of this study was to measure the long-term performance and economic returns of fungicides, to help growers select a top product.
Four small-plot experiments were conducted in 2012-13 at the Huron Research Station, Exeter, Ont. Lush plant growth was promoted using high seeding and nitrogen fertilizer rates. Disease development was encouraged by seeding white mould sclerotia and using overhead irrigation. Seven fungicides were compared to an untreated control treatment. An index was developed to measure disease severity over time — as the index increased, disease increased. Seed yield (kg/ha) was adjusted to 18 per cent moisture and return on investment ($/ha) accounted for the fungicide and application costs, with all other costs assumed to be the same.
Senator had low disease (see Figure 1), and the highest yield and return on investment (ROI). Propulse’s performance was similar to Senator, while Allegro and Lance had slightly lower ROI due to relatively high product cost. Allegro had the greatest difference in profit margins compared to the untreated control, in high-disease experiments (data not shown). Acapela and Priaxor had lower yield and ROI, compared to the top treatments. The alternative product, Heads Up, had poor performance, and was similar to the untreated control.
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– Chris Gillard is an associate professor of Dry Bean Agronomy & Pest Management at the University of Guelph, and Meghan Moran is a Canola and Edible Bean Specialist with Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA).
This article was originally published in Crop Protection 2016. Volume 82. Pages 75-81.
