With harvest approaching, Wisconsin growers are becoming concerned as tar spot continues to spread throughout the state. In the most recent USDA Crop Progress Report, 83% of Wisconsin’s corn crop was rated good/excellent. Of the top 18 corn producing states, the Badger State ranked second. Even though the corn crop is progressing well, tar spot is still spreading across the state. Disease was the big factor in August, said Nick Groth, agronomic service representative for Syngenta Crop Protection. He shared that disease pressure seems to be the major concern, as tar spot, along with southern rust and northern corn leaf blight, are showing up in many fields. Heavy pressure from these diseases can be found in certain fields throughout the state. Southern rust is a main concern now, but changing conditions could alter that. Cooler weather this week will slow development of the crop some. It may also slow southern rust development, but other diseases like tar spot may ramp up.
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