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Information about Corn Nematodes and SCN Available Online From ISU Crop Adviser Institute

By Greg Tylka, Department of Plant Pathology

A new source of information about the biology and management of corn nematodes is now available free online from Iowa State University. It’s a training module from the ISU Crop Adviser Institute. Topics discussed in the module include:

• the different species of nematodes that can parasitize corn
• review of the basic biology of corn nematodes
• symptoms of nematode damage to corn
• how to determine if a corn field has nematode damage
• current management options for corn nematodes
• the new cyst nematode discovered on corn in 2007

Certified crop advisers (CCAs) can earn 2.0 continuing education units (CEUs) by taking an exam after completing the module. 

The corn nematode module complements the ISU Crop Adviser Institute soybean cyst nematode (SCN) module, which is available online for free. The SCN module, also worth 2.0 CEUs for CCAs, discusses:

• the biology and life cycle of SCN
• signs, symptoms and interactions of SCN
• proper soil sampling and field scouting techniques
• management strategies for SCN
• sources of SCN resistance

Both training modules include computer-generated graphics and animations plus video clips that illustrate soil extraction techniques.

The corn nematode module received the Educational Materials Award of Excellence for Computer Software Programs from the American Society of Agronomy in 2009.  The SCN module won the same award in 2007.

To access the ISU Crop Adviser Institute modules
1. Register for a free account at Click on “My Account” from the menu on the left side of the main page, then click on “Create New Account” (thin yellow box at bottom right corner of screen) and follow the instructions.

2. Once an account is created, click on “Modules” from the left side of the front page and click on “Corn Nematodes” or “Soybean Cyst Nematode” from the list of module topics.  The corn nematode module is listed under Crop Management and Pest Management topics; the Soybean Cyst Nematode module is only listed under Pest Management.

3. After a module title is selected, click on the yellow word “Available” after “Free Online Version:”, then click on the “Add Module” text box. 

4. Finally, click on “Stream” to view the module online or click on “Download” to install the module onto your computer for use even when not connected to the Internet.

Although the modules are available for free from the ISU Crop Adviser Institute, there is a $15 per CEU fee for the exam to earn CCA credits. 

Modules on many additional crop production and protection topics are also available at no charge from the ISU Crop Adviser Institute.

Greg Tylka is a professor of plant pathology with extension and research responsibilities in management of plant-parasitic nematodes.


corn nematode module

Screen shot of the ISU Crop Adviser Institute corn nematode module home page.



soybean nematode module

Screen shot of the ISU Crop Adviser Institute SCN training module introductory page.


This article was published originally on 3/22/2010 The information contained within the article may or may not be up to date depending on when you are accessing the information.

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