The Bulletin Archives - Page 35 of 72

Tar Spot Updates in Illinois

August 31, 2018
Chelsea Harbach

The following is posted on behalf of Dr. Nathan Kleczewski, Field Crops Pathologist for Growmark. This content is from the Field Crop Disease Hub webpage Dr. Kleczewski curated.
If you do not think tar spot is an issue for corn production in Illinois and the region, please view this video from our colleague in Northern Illinois. This is why I have been receiving several calls and emails daily on this disease, and many people are wondering what we know and what they can do to manage it. …

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Looking for Palmer amaranth Populations

August 27, 2018
Aaron Hager

The weed science programs at Southern Illinois University and the University of Illinois are participating in a research project sponsored by the United Soybean Board to survey and monitor the potential for the evolution of weeds with resistance to glufosinate and dicamba. Early detection of evolved resistance to these herbicides could alert soybean farmers of the imposing threat in time for changes in management strategies that avoid herbicide failures. Researchers in Illinois will collect seed from at least two of our most challenging weed species,…

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Tar Spot in corn- requesting your help

August 24, 2018
Nathan Kleczewski

Tar spot is a relatively new disease in corn. It was first described in Illinois and Indiana in 2015, and was first located near DeKalb. Tar spot has been detected to some degree in Northern Illinois each year since. However, typically infections are sparse and the disease does not come in until later in the season. Consequently, yield loss due to this disease has been minimal, and the disease mostly considered an oddity.
However, in parts of Latin America,…

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Physoderma Brown Spot and Node Rot in Corn

August 10, 2018
Chelsea Harbach

The following is posted on behalf of Dr. Nathan Kleczewski, Field Crops Pathologist for Growmark. This content is from the Field Crop Disease Hub webpage Dr. Kleczewski curated.
Those of you who follow me on Twitter (@ILplantdoc) likely noticed numerous photos that I posted earlier in the season of Physoderma brown spot and node rot (PBS) on corn. Over the last week, I have had several calls about this disease, and reports indicate it was more prevalent than usual,…

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Physoderma reports on the increase in the region

August 10, 2018
Nathan Kleczewski

Physoderma brown spot and node rot is a disease that has been increasing in incidence in the Midwest over the past 5-10 years. We observed this disease frequently during scouting trips throughout the state conducted in late July. Recently, we have been receiving more reports of this disease and questions pertaining to it’s impact on the crop and management. I recently wrote an article on this disease and management recommendations on the Illinois Field Crop Disease Blog. …

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Spray Decisions for Frogeye Leaf Spot in Soybeans

July 27, 2018
Chelsea Harbach

The following is posted on behalf of Dr. Nathan Kleczewski, Field Crops Pathologist for Growmark. This content is from the Field Crop Disease Hub webpage Dr. Kleczewski curated.
Soybeans throughout the state are maturing and consequently, many people have been asking questions about the need to make a fungicide application for suppressing frogeye leaf spot (FLS) in soybeans.
Frogeye leaf spot is caused by the fungal pathogen Cercospora sojina. The pathogen can survive and overwinter in infested soybean residue for 2+ years,…

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Spray Decisions for Frogeye Leaf Spot on Soybeans

July 27, 2018
Nathan Kleczewski

Many people have asked about the need to make a fungicide application for frogeye leaf spot on soybeans this season. I have posted a new article on the Illinois Field Crop Disease Blog which reviews this pathogen, how it works, and some new tools that may help you with these important decisions. Find the article by clicking here.…

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Is the 2018 soybean crop as good as it looks?

July 24, 2018
Emerson Nafziger

If the appearance of the soybean crop going into late July predicts how it will yield, the 2018 crop in Illinois is going to be a high-yielding one. The crop in Illinois was rated at 78% good + excellent (G+E) as of July 22. Conditions across the US soybean growing regions are somewhat variable, but the 2018 crop is in good condition overall.
As I did with corn in the Bulletin on July 6,…

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Corn disease updates

July 19, 2018
Nathan Kleczewski

This week there has been a slight uptick in the amount of foliar disease reports in corn, likely as many people are actively scouting prior to making a fungicide application decision. The most common disease, as you may expect is Grey leaf spot. This disease is present to varying degrees in most fields. No big surprise there.
We have seen and received several reports and samples of Diplodia leaf streak. This disease can be caused by two different species of Diplodia,…

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Managing Japanese Beetles in Corn and Soybean

July 19, 2018
Nick Seiter

It is proving to be a big year for Japanese beetles in Illinois, and while populations should be starting to decline in much of the state, there is still a lot of feeding going on. The damage these insects cause can be eye-catching, especially on the edges of fields where Japanese beetles tend to congregate; however, before you decide to put out an insecticide, you want to be sure that decision is justified by the economics of the system.…

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