By Blake Jackson
An emerging corn leaf spot disease is being investigated in New York, with similar symptoms reported in Michigan.
Michigan State University researchers have identified affected fields in about 14 counties, where symptoms resemble those historically associated with Phaeosphaeria leaf spot.
Researchers have not yet confirmed the organism responsible for the symptoms. A fungus has repeatedly been found in samples from affected Michigan plants, including dark survival structures within leaf lesions. However, its presence does not prove that it causes the disease. Additional laboratory research is underway to determine the cause.
Corn growers in New York who observe similar symptoms are encouraged to report them and provide photos of affected leaves and fields, along with the town and county. Information about the hybrid, disease severity, and recent fungicide applications is also useful.
Researchers are especially seeking representative leaf samples because visual symptoms alone may not provide an accurate diagnosis. Laboratory testing will be essential to determine the disease’s cause and distribution.
Camilo H. Parada Rojas, a Cornell University field crops pathologist, is leading the request for reports and samples. For submitting reports contact Rojas at cp738@cornell.edu or +1 (919) 602-9841.
Photo Credit: gettyimages-klosfoto
Categories: New York, Crops, Corn