Bacterial Leaf Disease is Confirmed in One Illinois Corn Field
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[September 17, 2016]
CHAMPAIGN - In a recent survey of approximately 340 corn
fields in 68 Illinois counties, bacterial leaf streak was confirmed
in only one county, according to Kelly Estes, Cooperative
Agricultural Pest Survey (CAPS) coordinator, Illinois Natural
History Survey (INHS), Prairie Research Institute, University of
INHS, along with the University of Illinois Extension, Illinois
Department of Agriculture, and the U.S. Department of
Agriculture’s Plant Health Inspection Service (USDA APHIS),
surveyed corn fields after the disease was confirmed in Nebraska
Bacterial leaf streak was found in DeKalb County in northeastern
Illinois and also was confirmed in Iowa and seven other states
as part of this survey.
The symptoms of bacterial leaf streak are similar to the fungal
disease gray leaf spot (GLS). The bacterium produces irregular,
narrow brown to orange stripes between leaf veins that can be 1
inch to several inches long. GLS lesions tend to be shorter and
more rectangular in shape.
Bacterial leaf streak is spread by wind, rain, and irrigation,
and warm temperatures exacerbate the disease. Little is known
about the biology of the bacterium, but the USDA indicates that
it doesn’t pose a risk, and there is no evidence of negative
effects to corn yields or quality in the 2016 season. Fungicides
are not expected to control or suppress the disease.
Bacterial leaf streak will be on the list of diseases to survey
as part of next year’s CAPS program, Estes said.
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If you suspect bacterial leaf streak, submit a sample to the
University of Illinois Plant Clinic
About the Prairie Research Institute: The Prairie Research
Institute (PRI) at the University of Illinois at Urbana-Champaign
comprises the Illinois Natural History Survey, Illinois State
Archaeological Survey, Illinois State Geological Survey, Illinois
State Water Survey, and Illinois Sustainable Technology Center. PRI
provides objective natural and cultural resource expertise, data,
research, service, and solutions for decision making, the
stewardship of Illinois’ resources, and the public good.
[Lisa A. Sheppard]