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Reports of Goss’ Leaf Blight (Wilt) on Corn (8/03/17)

Areas of the state have received high winds, hail and rain, thus elevating the risk for the development of Goss’ wilt in corn.

Reports of Goss’ Leaf Blight (Wilt) on Corn

Areas of the state have received high winds, hail and rain, thus elevating the risk for the development of Goss’ wilt in corn. This week, a Goss’ wilt sample from Foster County was received by the NDSU Plant Diagnostic Lab and field reports of the disease have been received from agronomists in Cass County. There are no recommended in-season management tools for this disease, however identification will help shape future management decisions. This disease is best managed using resistant hybrids, crop rotation and corn residue management. The greatest amount of yield loss attributed to this disease occurs when a susceptible hybrid is infected early in the growing season (vegetative leaf stages). Late season infections occurring after tasseling and reproductive stages will often result in minimal losses.

When scouting corn fields, the first noticeable symptom of Goss’ wilt is the premature death of leaf tips or an entire plant. This can be caused by several disorders such as nutrient stress and drought stress. Tip dieback caused by Goss’ wilt will have irregular water soaked (greasy) lesions that extend towards the stem and with diagnostic freckeles within the lesion (Figure 1). Also, Goss’ wilt is often first noticed in ‘pockets’ in a field.

friskop

 

Andrew Friskop

Extension Plant Pathology, Cereal Crops

 

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