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Stunted yellowing corn could be nematodes
SDSU Extension: Stunted and yellowing corn plants in a patch. Picture taken June 4, 2018, South-Central South Dakota.
When is yellow corn a sign of corn nematodes? A South Dakota State University plant pathologist says there’s only one way to find out, “The best say to determine the cause of such a symptom would be to sample the plants AND the soil and send them to the lab to be tested for corn nematodes.”
Emmanual Byamukama tells Brownfield growers should test when they see stunted yellow corn in patches in their fields. Some nematodes feed on the outside surface of the root but others feed from within.
He says farmers need to use a probe or shovel to get 20 cores of soil between six and eight inches within the root zone.
As much as two cups of soil from each location in a field can be mailed or taken to the SDSU Plant Diagnostic Clinic for analysis.
Crop rotation and seed treatments are the main management tools.
AUDIO: Interview with Emmanual Byamukama ~
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