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White Mold Risk Remains Mixed Across the State (07/16/20)

Conditions for white mold continue to vary across the state.

Conditions for white mold continue to vary across the state.  Broadleaf crops are sensitive to white mold once they begin flowering. Conditions for white mold are favorable when you have adequate soil moisture (a minimum of 1-2 inches of rain 1-2 weeks before flowering), wet canopies and cool to moderate temperatures (temperatures above 85 F inhibit white mold).  Rainfall and temperatures have varied across the state, resulting in varied risk to white mold.  The canola risk map, available at https://www.ag.ndsu.edu/sclerotinia/riskmap.html, which takes in to account conditions favorable for infection, indicates heavily variable risk as well (Figure 1).  We recommend that you evaluate risk in your area.  A comprehensive review of conditions favorable for white mold, research updates and more is available in the July 2 issue of the crop and pest report.

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Sam Markell

Extension Plant Pathologist, Broad-leaf Crops

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