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Should you be scouting for Goss's wilt?
Goss's wilt was found recently on plants in Iowa and Nebraska. If you are scouting for Goss's wilt, focus your attention on fields that are planted to susceptible hybrids, have a history of the disease, have surface corn residue, and have been recently injured by sever weather.
Unusual Foliar Diseases Showing up in Iowa Corn
By Alison Robertson, Department of Plant Pathology
Over the past week I have received emails, phone calls and samples of two leaf spots that occur in Iowa from time to time, Holcus leaf spot and Physoderma brown spot.
HOLCUS LEAF SPOT
Holcus leaf spot is caused by the bacterium Pseudomonas syringae. Symptoms are light tan (sometimes almost white), round to oval spots, which may appear water soaked at the margins or have a light brown border occur on the lower leaves (Figure 1 and 2).