By Pierce Paul and Anne Dorrance, Ohio State University Extension
Over the last few years, interest in nematodes and the use of nematicide seed treatments in corn have increased among producers all across the Midwest. When present and in high numbers, nematodes can indeed cause considerable yield loss in corn, and quite often these losses may go undetected or may be attributed to other causes. In corn, nematode problems are usually very difficult to detect because these pathogens usually cause uneven growth, without any clear above-ground symptoms. Uneven growth could be the result of several factors including other soil borne pathogens, poor drainage, soil compaction, and herbicide carry over; nematodes are rarely ever considered the cause of such a problem.
Several different types of nematode can attack corn including spiral, lesion, cyst (this is not the soybean cyst), stubby root, needle, lance, and dagger nematodes, and the level of damage and yield loss depend on the type of nematode present and the population level.… Continue reading