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Multiple plant-parasitic nematodes feed on corn roots including Pratylenchus, Longidorus, Xiphinema, and Helicotylenchus spp., among others. Nematodes are transparent roundworms that can't be seen with the naked eye. 53% of continuous corn fields had moderate to high levels of nematodes compared to 41% of first-year corn fields. For example, when I ran the nematode assay at Delaware, I ran soil samples on Baermann funnels, which cause the living nematodes to wiggle through filter paper and collect at the bottom of a funnel. The damage threshold for some of the corn nematode pests, such as needle and sting nematodes, can be as low as 1 per 100 cm 3 of soil. These symptoms typically are similar to those of nutrient deficiencies. Damage caused by root feeding can further injure a plant by allowing fungal and bacterial pathogens to enter into the plant. Globally, root-lesion nematodes are the most common nematode pests of corn and several species in this group cause significant damage (1, 2, 3). Quantification of corn nematodes might differ depending on the methods used as well. Although prevalent, they rarely cause economic damage. If nematodes are feeding on the roots, a plant may look yellowed, wilted, or stunted and infected food crops will usually yield poorly. Nematodes live below ground and can be hard to detect, but even low infestations can result in a loss of 1-10 bushels per acre. Nematodes injure corn plants by feeding on the roots and by creating wounds that allow bacteria, fungi and other pathogens to infect the plant and cause secondary rots. In this study, lance, stubby-root and spiral nematode were the species most commonly found over damage threshold. The initial population of spiral nematode in this soil was 4,627 per kg of soil, whereas the initial number of lesion nematode was 510 per kg of soil. Only living nematodes are quantified using this technique. 41 of 329 fields had two or more species of nematode at medium or high infestation. Corn field showing nematode injury to roots. Some nematodes are also known to transmit viruses to the plants they feed on. Nematodes that feed on corn. After four years of intensely surveying field soils in 17 counties from western through northern NY counties (2014-2016), the nematode was identified for the first time in … Heterodera glycines The soybean cyst nematode (SCN) is considered the single largest cause of soybean yield losses nationwide. Feeding by plant-parasitic nematodes generally never results in characteristic above ground symptoms. Soil samples were collected from a corn field in Cass County to screen these corn varieties for their reactions to the root-lesion nematode and spiral nematode. Damage is intensified by environmental stresses, such as seedling diseases, insect feeding and drought. 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