Corn nematodes and soybean cyst nematode have several things in common. But there are many important differences, too. Iowa State University Extension plant pathologist Greg Tylka, who specializes in management and control of nematodes in Iowa crops, explains the similarities and differences between corn nematodes and SCN in the following article.
Corn nematodes and the soybean cyst nematode are microscopic, plant-parasitic worms that live in the soil and feed on plant roots. Iowa crop producers and agribusiness professionals generally are aware of the soybean cyst nematode and its biology, scouting and management. But many people want to learn more about the biology, scouting and management of corn nematodes.
There are some similarities but also many major differences in various aspects of corn nematodes and the soybean cyst nematode. Keeping these similarities and differences in mind is important when trying to determine the most economical and effective way to manage these pests.
The information above is for most commonly found corn nematode species. But some of the generalizations are not true for the needle and sting nematodes. Following are specific exceptions to the generalizations listed in the table for needle and sting nematodes.
• only found in soils that are more than 70% sand
• sample spring or fall, not mid season
• extremely high damage potential; damage threshold is one per 100 cubic centimeters soil
• narrow host range
• non-host crops for management include alfalfa and soybean