Darcy Telenko

85 articles by this author

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Southern corn rust has now been confirmed in four counties (Knox, Dubois, Warrick, and Shelby) this week in Indiana (Figure 1). While tar spot continues to be documented across the state (Figure 2). I suggest if you have not gotten out and looked for these diseases now is the time. Even if your corn is approaching black layer it will be important to document tar spot in your fields for the future disease management decisions. There are currently 41 counties with a positive confirmation of tar spot (Figure 2). As we are learning this season when we have had favorable environmental conditions there may be pockets of tar spot even in areas that have not seen the significant yield impacts previously. In the map all gray counties indicate that tar spot was found in the county in previous seasons. I have been getting many questions on if a late season[Read More…]


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Red crown rot of soybean has become a new concern this season in Indiana after a few localized occurrences have been found in previous years (see map, Figure 1A). We also have our first reports for 2024. This disease is caused by the soilborne fungus, Calonectria ilicicola. At this point in the field season, we are on the hunt to determine how widespread the issue may be here in Indiana. Therefore, we need your help in documenting red crown rot and collecting samples. What to look for: The disease may appear in patches in a field similar to our other soilborne diseases such as sudden death syndrome (SDS) and brown stem rot (Figure 1B). Early foliar symptoms may also mimic these diseases, which include chlorosis (yellowing) and necrosis of leaf tissue between leaf veins (Figure 1C). Therefore, it is important to take a few plant samples and check out the[Read More…]