13 articles tagged "tar spot".



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It is important to continue to scout for diseases in both corn and soybeans. Recent rains have created favorable environmental conditions for the development of foliar diseases in both crops. In our scouting rounds this week we continue to find gray leaf spot, northern corn leaf blight, and tar spot in corn (Figure 1 and 3), and frogeye leaf spot, downy mildew and Septoria brown spot in soybean (Figure 2). In addition, we continue to add counties with active tar spot and southern rust in Indiana. The most frequent question I have received is, “Should we make a fungicide application?” My response – What diseases are you finding in your field? What is your hybrid/variety susceptibility and field history? What growth stage? Are you irrigating? A fungicide application can be effective at reducing disease and protecting yield, but there are a number of factors that need to consider: the field[Read More…]







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Soybeans We are starting to see a number of diseases in soybean across Indiana. This week in our plots in both northern and southern Indiana initial foliar symptoms of sudden death syndrome are making an appearance. In addition, we continue to see frogeye leaf spot and Septoria brown spot – the levels of both of these diseases were very low and our soybean are about R4 (beginning pod) to R5 (full pod). I suspect that if we continue to receive intermittent rain, we might start to see a bit more disease in soybean. Corn Tar Spot – We have confirmed 11 counties with active tar spot as of August 28 for the 2019 season. These counties all had a previous history: Elkhart, Jasper, Kosciusko, La Porte, Lagrange, Lake, Marshall, Noble, Porter, Pulaski, and St. Joseph (figure 1). I have included the 2018 tar spot map from Indiana for your reference[Read More…]



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