Southern rust has been confirmed in corn in three eastern Nebraska counties this week. Corn fields should be scouted soon and frequently in the coming weeks for this and other diseases in case treatment is necessary.
Ponding or flooding of fields affects corn differently at different stages, depending on duration of flooding and other factors. Growers should assess the potential for nitrogen loss and increase scouting for corn disease in these fields.
After recent severe storms that rolled across parts of Nebraska, growers are encouraged to wait 7-10 days to fully assess crop damage and determine next management steps. Research-based estimated yields from replanting now are included.
Severe weather and wet conditions across much of Nebraska this week may favor increased development of diseases in corn, particularly bacterial leaf streak and Goss’s bacterial wilt and blight. For assistance in correctly identifying diseases, submit samples to the Plant & Pest Diagnostic Clinic.
Management of foliar fungal disease is achieved in many of our field crops by applying fungicides. Over the past several years, there have been examples of misidentification of some bacterial diseases that are easily confused for fungal diseases in field crops.