Suzanne Bissonnette, Author at farmdoc

Palmer Amaranth ID of seed or plant tissue and Herbicide Resistance Testing at the University of Illinois Plant Clinic

June 12, 2017

Are you having trouble with Palmer amaranth? We have something new for you.
NEW Palmer ID test available this year: We spent a long winter optimizing a new assay in collaboration with Dr. Pat Tranel’s lab to aide in Palmer amaranth ID. Contamination of seed mixes with Palmer amaranth became a wide-spread issue last year. Efforts to determine if a seed mixture is contaminated can be hampered by low germination rates and slow grow outs in greenhouse tests.…

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2016 University of Illinois Plant Clinic Herbicide Resistance Report

January 18, 2017

Glyphosate and PPO inhibitor Summary: 593 field samples representing approximately 2,000 waterhemp or palmer amaranth plants were tested for herbicide resistance at the University of Illinois Plant Clinic in the 2016 season. The Plant Clinic started offering herbicide resistance testing of waterhemp for resistance to two groups of herbicides (glyphosate and PPO inhibitors) in 2015. We added palmer amaranth testing in 2016. Almost twice as many whole fields were tested 2016 compared to last year, 593 vs.…

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Soybean Rust found in Southern Illinois 2016

September 20, 2016

Soybean rust (Phakopsora pachyrhizi) has been found in southern Illinois. Samples were collected in Williamson county on 9/11/16 to make observations for other fungal foliar leaf disease. Soybean rust was found sporulating in pustules on the bottom surface of the leaves. The field was at R6 so yield loss to that field is unlikely. While this very late in the season, there are still many fields in southern Illinois that are green and producers should consider scouting for soybean rust.…

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2016 Tar Spot again found on corn in Northern Illinois

September 13, 2016

Corn leaf samples from LaSalle county have been positively identified by the University of Illinois Plant Clinic to be infected with Tar Spot Phyllachora maydis. Commercial Agriculture Extension Educator Russ Higgins found the disease while field scouting. The fungal leaf blight was identified in numerous northern Illinois and northern Indiana counties in 2015.
Tar Spot has distinctive signs and symptoms. The fungal fruiting body, called an ascomata, looks like an actual spot of tar on the leaf. …

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New bacterial leaf disease “Bacterial leaf streak” identified in one northern Illinois County

August 26, 2016

Extension Staff Join with other Agencies to Survey Illinois for New Corn Disease 2016: The USDA just announced the presence of Bacterial leaf streak in corn, as determined by recent surveys of the Corn Belt states. In Illinois, a cooperative survey was organized with APHIS-PPQ (Animal Plant Health Inspection Service), IDA (Illinois Department of Agriculture), CAPS (Illinois Natural History Survey’s Cooperative Agricultural Pest Survey) and University of Illinois Extension to provide a rapid response to determine distribution.…

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Herbicide Resistance in Waterhemp: PPO inhibitor and Glyphosate Testing University of Illinois Plant Clinic 2016

May 18, 2016

What is your waterhemp doing ? Waterhemp glyphosate and PPO inhibitor resistance testing was offered by the Plant Clinic for the first time in 2015. Due to the strong demand for this testing, we are offering it again this year. We adapted protocols developed by Dr. Tranel’s lab in the Dept. of Crop Sciences to transition the molecular protocols for glyphosate and for PPO Inhibitor resistance from a research laboratory to a service lab offering. In 2015,…

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University of Illinois Plant Clinic: Celebrating 40 Years of Service to Illinois

May 18, 2016

Anniversary Overview of Plant Clinic: Welcome to another year of service at the Plant Clinic! Since 1976, the University of Illinois Extension Plant Clinic has served as a clearinghouse for plant problems. Housed first in the Department of Plant Pathology and now Crop Sciences, the Plant Clinic was originally developed to help County Cooperative Extension staff and campus-based Extension specialists with requests for diagnoses on a wide variety of plants. By acting as a centralized diagnostic laboratory,…

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

October 5, 2015

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

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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Plant Clinic Screening Waterhemp for Herbicide Resistance this Season

May 19, 2015

New testing for 2015: U of I Plant Clinic is offering molecular screening of waterhemp populations for resistance to glyphosate and PPO inhibitor herbicides this growing season. Protocols developed by University of Illinois Weed Scientist Dr. Pat Tranel, supported by Illinois Soybean Association and Pioneer, are now being offered through the Plant Clinic. The fee for the molecular testing is $50 per tested field. This includes both tests.
Herbicide-resistant waterhemp populations continue to expand into more areas of Illinois each season.…

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