49 articles tagged "Plant Diseases".


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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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Frogeye leaf spot (FLS) is becoming a serious threat to soybean production in Indiana and surrounding states. Traditionally a southern disease, it can cause yield loss up to 60%. In recently years, FLS severity has been on the rise in the North Central region. It caused estimated yield loss worth $51 million in Indiana and $428 million in the North Central region in 2018. FLS infection can occur at any stage of soybean development, but most often occurs after flowering. Initial symptoms are small, dark spots, which will eventually enlarge to a diameter of up to about ¼ inch. The centers of the lesions become gray to brown and have a reddish-purple margin. Stems and pods can also be affected later in the season. Symptoms on stems are long narrow dark lesions with flattened centers. Pod lesions will be circular to elongate, slightly sunken and reddish-brown. Seed symptoms will appear[Read More…]


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