Generally, plant-parasitic nematodes are discussed as a problem on corn in July and August because that usually is the time when their damage becomes apparent and also when soil samples should be collected for diagnosis. But there is an exception to this generalization--the needle nematode. The needle nematode has been found in several fields in southeastern Iowa in past growing seasons, and this nematode is unusual in many regards.
Iowa State University
Tylka, Gregory L., "Look out for an early season corn nematode problem" (2006). Integrated Crop Management News. 1232.
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