She said the reniform nematode is more of a silty soil type of nematode. This one is most often in north Alabama, but there is a place in the southern area of the state near Atmore where there’s a hotspot of those nematodes. During cool, wet springs—especially in early-planted corn—the stubby-root nematode will show up.
Visible Signs
Lawrence said the symptoms of a nematode problem are not easy to tell apart above ground.
“Below ground, the root knot nematode will leave some galls, but the reniform will not,” she said. “Truly the best symptom we have is yield loss, although it is not exactly a visual producers can identify and correct because it appears too late.”
Symptoms are nondescript—stunted, unhealthy-looking plants. The only way to know which nematode is causing problems is to conduct a soil test and have it analyzed in the lab. When the results are in, producers can implement control measures.
Control
“The best thing producers could ever do to avoid nematode problems is crop rotation,” Lawrence said. “Our reniform nematode does not go to corn or peanuts. There are also resistant soybeans. If producers can rotate to any of those others, that helps curb nematode presence tremendously.”
The root knot nematode does go to a lot of other crops, but the southern root knot that attacks cotton does not attack peanut. Lawrence said that’s an ideal rotation.
Source : aces.edu