Root Knot Nematodes and Southern Blight in Soybeans
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Collapse ▲Now is the time to take nematode samples if you suspect that you have a problem. You want to take the samples before Thanksgiving, as they move deeper into the soil profile as the temperatures cool down. Sampling supplies are available at the Extension office. It is important that you take nematode samples so you can determine what types of nematodes you have so you can plan for the following crop.
Nematodes only move about five feet in a year so if they are spreading, they are hitching a ride on your equipment. If you have nematodes make note what fields you have issues with and plow them last! The best thing you can do is clean your equipment with a 10% bleach solution. If you can’t/don’t have time at least knock the big chunks of soil off of your equipment before moving to the next field!
Corn, cotton, soybeans, and snap beans are all hosts of root knot nematodes. Wheat is not a host. The best thing you can do is select a resistant variety. Adding RKN resistant varieties into your rotation can help reduce populations as long as the variety is resistant to the species of RKN you have. Southern RKN races 1 and 3 are present in NC. It is important to take nematode samples to ensure that you are selecting the variety with the correct resistance!
If you need assistance sampling don’t hesitate to call!
Southern root knot nematode damage
Southern Blight
Galling caused by southern root knot nematodes
Non-resistant variety vs. root knot resistant soybean variety