By Scout Nelson
Southern rust has been recently confirmed in several South Dakota corn fields. Reports began in late July, and upon field scouting, experts found the disease in Clay, Yankton, and Bon Homme counties. Photos also confirmed cases in Union County. In addition, early signs of the disease; just one or two lesions on some plants, were noticed in Brookings, Moody, and Deuel counties.
This fungal disease appearing during the tassel to silk stage is rare in South Dakota. Its early presence is a concern because it can reduce corn yields. Weather conditions like high humidity and regular rainfall are favorable for fast disease growth. That is why careful and frequent scouting is very important right now.
Fields with irrigation systems are especially at risk and should be monitored closely. Farmers are encouraged to scout their fields regularly to check for southern rust symptoms and take action if needed.
If southern rust is found, there are fungicide options available to help manage it. Farmers should refer to the latest South Dakota Pest Management Guides to find the most suitable fungicide for their field. It’s also important to follow label directions for application timing and corn growth stage.
The Crop Protection Network provides a helpful guide titled Fungicide Efficacy for Control of Corn Foliar Diseases. This resource helps farmers choose the most effective fungicide products for corn diseases, including southern rust.
Photo Credit: gettyimages-oticki
Categories: South Dakota, Crops, Corn