Crop & Pest Report

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Corn Disease Survey Update (09/15/16)

The NDSU corn pest survey scout has visited 21 fields over the past month.

Corn Disease Survey Update

The NDSU corn pest survey scout has visited 21 fields over the past month. The most common disease detected has been common corn rust, followed by Goss’ leaf blight, then northern corn leaf blight. Common corn rust is considered a superficial disease in ND as most hybrids have tolerance that offset any potential yield loss. Goss’ leaf blight was identified in four fields, but in low incidence within each field. Yield loss attributed to Goss’ leaf blight can be substantial if severe disease development occurs prior to tasseling (Figure 2). Management of Goss’ leaf blight is best accomplished using crop rotation (avoid corn on corn), tillage (where appropriate) and tolerant hybrids (often most effective management tool).

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Andrew Friskop

Extension Plant Pathology, Cereal Crops

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