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Observations from the 2019 Corn Disease Survey (09/12/19)

Over a three-week span, members of the NDSU corn pathology program were on the highways and gravel roads scouting corn fields for diseases.

Over a three-week span, members of the NDSU corn pathology program were on the highways and gravel roads scouting corn fields for diseases. This year the scouts most commonly identified the foliar diseases common corn rust (Figure 1) and Goss’ wilt (Figure 2). Other observations included purple leaf sheath syndrome (when pollen becomes trapped in leaf sheath and colonized by saprophytic fungi; Figure 3) and smut. Of the diseases and disorders mentioned, Goss’ wilt poses the greatest economic threat in ND, especially when susceptible hybrids are used in minimal tillage systems. This year Goss’ wilt was identified in 54% of the fields (down from last year’s 66%). Fortunately, most of the Goss’ wilt occurred in small pockets of the field with no documentations of severe field wide epidemics.

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I would like to thank Jessica Halvorson, Michaela Halvorson and LeAnn Lux for their help in surveying fields.

 

 

Andrew Friskop

Extension Plant Pathology, Cereal Crops

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