Diseases

Another CORN DISEASE ALERT: New Bacterial leaf disease ‘Bacterial Stripe’ (Burkholderia andropogonis) of Corn identified in Illinois

  • October 5, 2015

  • Suzanne Bissonnette

Symptomatic corn leaf samples from Champaign County, Illinois have been confirmed positive for the bacterium Burkholderia andropogonis (Pseudomonas adropogonis (Smith) Stapp.) the causal agent of Bacterial Stripe disease by the University of Illinois Plant Clinic. This has been reported to the Illinois Department of Agriculture and the USDA. The pathogen was identified by symptomology, bacterial colony characteristics and  16S DNA sequencing.
Bacterial stripe foliar symptoms unfortunately are similar to other endemic bacterial leaf pathogens of corn,…

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CORN DISEASE ALERT: New Fungal Leaf disease “Tar spot” Phyllachora maydis identified in 3 northern Illinois counties

  • September 21, 2015

  • Suzanne Bissonnette

Tar spot confirmed:  Announced by the Illinois Department of Agriculture today. Corn leaf samples from 3 northern Illinois counties have been confirmed positive for the fungus Phyllachora maydis by Megan Romby National Plant Pathologist with the USDA Animal Plant Health Inspection Service in Beltsville, MD. Positive counties in Illinois are LaSalle, DeKalb and Bureau. The samples were collected from commercial fields by Monsanto breeders and pathologists and sent to Dr. Kiersten Wise in response to her inquiry for samples and distribution information of the Tar spot pathogen.…

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Ewing Demonstration Center Fall Field Day – September 10th

  • August 28, 2015

  • Nathan Johanning

The University of Illinois Extension will host its annual Ewing Demonstration Center Fall Field Day on Thursday, September 10, 2015 at 9:00 a.m.  The Ewing Demonstration Center is located in southern Illinois about 20 miles south of Mt. Vernon at 16132 N. Ewing Rd; Ewing, IL 62836.  It is on the north edge of the village of Ewing, north of the Ewing Grade School on north Ewing Road.  Watch for signs.
The ongoing research this year includes trials on soybean cover crops,…

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Got Crazy Top?

  • July 30, 2015

  • Emerson Nafziger

Crazy top, named for the odd formations of the leaves or tassel due to hormonal effects of the disease, is typically found on corn plants that were submerged for a few days early in the growing season. A description of the disease and of its symptoms can be found at http://bulletin.ipm.illinois.edu/pastpest/articles/200220c.html
While a lot of corn was submerged during early growth in Illinois this year, we haven’t been seeing a lot of this disease.…

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Brownstown Agronomy Research Center Field Day – August 5, 2015

  • July 27, 2015

  • Aaron Hager

The 2015 Brownstown Agronomy Research Center Field Day, presented by the University Of Illinois Department Of Crop Sciences, will be held on Wednesday, August 5. Extension researchers and specialists will address issues pertinent to the current growing season. The tour will start at 8 a.m. and will last approximately three hours. It will be followed by lunch provided by U of I Extension. 2.5 hours of Certified Crop Adviser CEUs have been approved.
Shaded tour wagons will take participants to each stop.…

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Corn disease update and farewell

  • June 30, 2015

  • Aaron Hager

Last week, I visited all of the University of Illinois corn variety trials in the northern half of the state.  Gray leaf spot and northern leaf blight were beginning to appear in most of the locations, but were the most obvious at the trial located near Perry, IL (Pike County).
With the amount of rainfall received in the past few weeks, it is not surprising that these diseases were beginning to appear.  Since hybrids differ in their level of susceptibility to these diseases,…

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Stripe rust and Fusarium head blight (scab) concerns in Illinois

  • May 14, 2015

  • Aaron Hager

Stripe rust of wheat has been observed in different parts of Illinois within the last week. Although some varieties have very good resistance to stripe rust, there are still several varieties that are susceptible. Stripe rust is able to flourish under the cooler temperatures we’ve had over the last few days. With rain in the forecast in parts of the state over the next few days, favorable conditions for this disease likely will continue.
Although some wheat fields in the state are already past the critical period for applying a fungicide for protection against Fusarium head blight (a.k.a.…

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