Improving Sclerotinia disease control in edible beans and canola
Amin Omar, Syama Chatterton
Alberta Pulse Growers, WGRF
April 2013 - March 2017
Sclerotinia disease continues to be a production constraint to many crops in Alberta. Initial research has potentially found two new effective management tools, but more research is required to confidently support them.
Determine if there is a benefit between micronutrient and Sclerotinia fungicide combinations on bean and canola for white mold and stem rot management.
In vitro, Fluazinam (1.67mg/mL) + CuSO4 combination showed to be the most effective with a log reduction of 3.64. Heads Up® was the best at reducing white mold in dry bean for 3 out of 8 site years and had the highest seed yield for dry bean in 5 out of 8 years. Acibenzolar-S-methyl and β-Aminobutanoic acids were best at reducing stem rot on canola and β-Aminobutanoic acid had the highest yields in 4 out of 8 site years. Fluazinam activity was the most responsive to the addition of micronutrient and was greatly enhanced in its ability to reduce S. sclerotiorum biofilms. Additionally, if the field contained a Sclerotinia-tolerant variety, the severity of sclerotinia was consistently reduced. However, these plots did not consistently produce higher yields.
If sclerotinia is a constant hinderance on successful canola production, Sclerotinia-tolerant varieties consistently delivered on reducing the amount of disease present. Losses from disease must be compared to the potential yield loss of the Sclerotinia-tolerant varieties. Tank mixing a micronutrient (CuSO4, AgNO3 or ZnSO4) with a fungicide (fluazinam or cyprodinil) can improve fungicide efficacy by 1%. Although the increase is small, this control of white mold would provide over $2 million in canola yield savings annually.
Keywords:Sclerotinia, Edible beans, Beans, Sclerotinia tolerance