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Tar spot threat escalates in Kansas cornfields

Tar spot threat escalates in Kansas cornfields


By Scout Nelson

Corn producers in Kansas are increasingly concerned about the rapid spread of tar spot, a fungal disease previously considered a distant problem. According to Kansas State University Extension specialist Rodrigo Onofre, the disease has rapidly expanded, doubling its presence in Kansas counties annually and significantly reducing yields in susceptible hybrids.  

Speaking at the Kansas Corn and Soybean School in Parsons, Onofre described tar spot's rapid progression, particularly in the northeast region of Kansas. The disease, which causes black, raised bumps on corn leaves, has progressed quickly, demanding immediate attention from farmers.  

Onofre emphasized that early detection is crucial, with the disease sometimes appearing as early as the V3 growth stage of corn. 

Effective management of tar spot includes the use of fungicides and tillage practices. Onofre pointed out that multiple applications of fungicides could be necessary to control the disease. Managing crop residue is vital, as tar spot can survive in it and pose a risk for future seasons. 

The disease thrives in wet conditions, making areas with high rainfall or irrigation particularly susceptible. Onofre stressed that while temperature isn't a major factor in tar spot's spread, leaf wetness is. This poses a unique challenge in fields with irrigation systems, where disease can be more prevalent. 

Tar spot's impact on the agricultural economy is significant, with millions of dollars lost across affected regions since its first detection in the U.S. in 2015. To combat this, Onofre recommends careful field scouting and planting resistant hybrids as proactive measures. 

 

Photo Credit - gettyimages-oticki

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Categories: Kansas, Crops, Corn

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