General information on plant disease management

We have posted some new materials (along with cool visual aids) on basics of integrated disease management.  Hopefully this information will be useful to you during this busy meeting season.  Click here to view this post.

 

Remember you can sign up for updates to the Illinois Field Crop Disease Hub

Dr. Nathan Kleczewski Extension Field Crop Pathologist UIUC


Efficacy vs management trials

With meeting season going full blast, you will be seeing a slew of data pertaining to disease management and the efficacy of various disease management products.  We posted some general tips to keep in mind at the Illinois Field Crop Disease Hub that can be viewed HERE.

Remember that you can sign up for Hub updates (Hubdates?) by entering your email information on the main page.

Nathan Kleczewski- Field Crop Plant Pathologist and Extension Specialist-UIUC


2019 Applied Research Results, Field Crop Disease and Insect Management now available

The 2019 edition of our annual report on applied research in field crop disease and insect management can be downloaded at the following link: https://uofi.box.com/v/2019PestPathogenARB

 

Each year, University of Illinois plant pathologists and entomologists produce a summary of the applied research we have conducted to inform disease and insect management practices in Illinois. This information provides a non-biased, third-party evaluation of control tactics such as pesticides and resistant varieties for use in corn, soybean, and wheat.

The 2019 report includes information on the following topics:

  • Surveys of insect pests and soybean cyst nematodes
  • Control evaluations for diseases of corn, soybean, and wheat (including southern rust, tar spot, fusarium head blight, and more)
  • Evaluations of Bt trait packages and soil insecticides in corn and foliar insecticides in soybean (including western corn rootworm, bean leaf beetle, dectes stem borer, and others)

image of the cover of the 2019 applied research report

For questions about the guide, please contact:

Nick Seiter, Field Crop Entomologist | nseiter@illinois.edu

Nathan Kleczewski, Field Crop Plant Pathologist | nathank@illinois.edu


UIUC Field Crop Extension Conferences- Sign up today!

What do you need to know for the 2020 growing season? The University of Illinois will address several key topics at four regional conferences around the state in January and February. The meetings will provide a forum for discussion and interaction between participants, University of Illinois researchers, and Extension educators.

Conference dates and locations are:
Jan. 22 DoubleTree by Hilton, Mount Vernon
Jan. 29 Brookens Auditorium at University of Illinois, Springfield
Feb. 4   I-Hotel, Champaign
Feb. 12 Kishwaukee College, Malta

2020 topics and presenters include:

“It’s Tough Out There: Supporting Farmers and Promoting Mental Health” by Josephine Rudolphi, U of I Department of Agricultural & Biological Engineering

“Illinois Weather Review: A Look Back at 2019 & Expectations for 2020 and Beyond” by Trent Ford, Illinois State Water Survey, State Climatologist

“How Should We Manage Today’s Corn Hybrids?” by Emerson Nafziger, U of I Department of Crop Sciences, Professor Emeritus

“Updates in Field Crop Disease Management” by Nathan Kleczewski, U of I Department of Crop Sciences

“The New Era of Herbicide Resistance… and You Thought the Last Era was Difficult” by Aaron Hager, U of I Department of Crop Sciences

“What’s the Real Deal with Cover Crops & Soybean Cyst Nematode?” by Chelsea Harbach, U of I Extension

Insect Management in Corn and Soybeans” by Nick Seiter, U of I Department of Crop Sciences

Hemp, What Have We Learned in 2019?” by Talon Becker (Mt. Vernon), Jessica Soule (Springfield), and Phillip Alberti (Malta, Champaign), U of I Extension

Certified crop advisers can earn up to eight hours of continuing education credit. Advance registration, no later than one week before each conference, is $100 per person. Late and on-site registration is $120. Register for the conferences online at https://go.aces.illinois.edu/IL2020CMC.

#illinois   #corn  #soybean  #wheat 

 

— University of Illinois Extension


Looking for Phyllachora samples on grasses- need your help!

Last year we started a project focusing on determining origins of Phyllachora maydis, the causal agent of tar spot of corn, in the United States.  As part of this project, we need to collect Phyllachora species from different hosts and areas.  Today I went for a lunchtime walk and was able to find Phyllachora spp. on four different grass hosts.  Note the large, somewhat raised stroma that follow the veins on most occasions.  They can have halos around them as well.  If you are walking fields, gardens, parks and happen to come across any putative Phyllachora, please send leaves and seed heads to the UIUC plant diagnostic clinic

Phyllachora stroma following the veins, which is somewhat typical for the genus.  N. Kleczewski

Phyllachora spp. on a senesced grass.  N. Kleczewski

Phyllachora spp. with halos around stroma.  N Kleczewski

at S-417 Turner Hall, 1102 S.Goodwin Ave. Urbana, IL 61801 ATTN Tar spot survey.  We really can use your help in this regard!

Nathan Kleczewski- Extension Plant Pathologist UIUC


Harvest time is not the time to determine if a disease affected your crop

It happens every year.

A field is about to be harvested and something is awry.  Perhaps the plants are lodged, ears are poorly filled, or pods shrunken.  What happened to my crop?

From a plant disease perspective, it is nearly impossible to provide any useful information to the producer.  Many pathogens that can cause crop diseases are also excellent saprophytes.  That means they utilize dead or dying plant tissues for nourishment.  Consequently, when plants prematurely senesce, these organisms see these plants the same way as I viewed Golden Corral in college- it’s chow time!  As a result, it is common to observe senesced plants in fields with multiple “pathogenic” organisms present in or on tissues.  For example, I recently read a report form the diagnostic clinic where four pathogenic organisms were detected in soybean stems.  Was it organism 1,2,3, or 4 that caused the disease?  All of them?  Was it something else related to the environment that killed the plant and all 4 moved in afterwards?  Therein lies the problem- when plants are dead there is no way to know what killed it.    The most important thing needed to properly manage a disease is a confidant identification of the pathogen and knowledge that it was the cause of reduced plant performance.

This is why it is so important to be checking fields throughout the season.  Assessing the health of the crop while most plants are still green allows you to understand if the issue is related to environment, disease, insects, or some other factor.  During the season, make a point to assess your fields at least 4-5 times throughout the season, from planting through maturity.  Look for plants that exhibit abnormal growth or symptoms.  Send samples to your state diagnostic clinic for assessment.  By doing this, you arm yourself with the information you will need to defend yourself from potential yield limiting diseases in subsequent years.

Don’t be that guy.  Don’t wait until it is dry.


Late season tar spot- what is on the horizon?

There has been some chatter about tar spot starting up a bit in Northern Illinois corn fields.

Tar spot risk map as of 9.3.19. Most fields are near or past R5 in many of the areas in question.

However, crops are almost at R5 in many places.  What options do we have and what can you expect?  Check out our new post on the Illinois Field Crop Disease Hub by clicking here.  Remember to sign up at the website for updates and look forward to new materials such as factsheets, images, and guides by Spring, 2020!


Diagrams to help you rate foliar disease on corn

Many in the agricultural community, as well as researchers annually rate corn for disease as a means to assess hybrid response, hybrid effectiveness, or potential disease level on field productivity.  It can be difficult to rain the eye to accurately measure disease on foliage, and differences in the type and size of the structure or lesion associated with the pathogen varies significantly.  The four links below will direct you to disease area diagrams we developed in order to help you obtain accurate disease severity estimates in your fields. The method you use to assess disease severity may differ depending on the overall objective. The diagrams below are cor grey leaf spot, northern corn leaf blight, common rust, and southern rust.  These can be printed, laminated, and taken to the field with you to assist your ratings.

SAD_CommonRust SAD_GreayLeafSpot SAD_NorthernLeafBlight SAD_SouthernRust