Journal of Nematology (2007) 39, 76-77

T.A. Jackson, R.M. Harveson, J.G. Counsell, K.A. Goings and D.W. Miller (2007)
Plant-parasitic nematode genera in Nebraska corn fields
Journal of Nematology 39 (1), 76-77
Abstract - Society of Nematologists 46th Annual Meeting San Diego, California July 28-August 1, 2007
Abstract: Reports from numerous states have attributed disease in corn and subsequent yield loss to plant-parasitic nematodes. Some recent changes to corn cropping practices are expected to favor nematodes and may lead to an increase in disease caused by nematodes. Limited data are available for nematode populations, distributions, damage and management in corn. Nematodes were extracted from soil and roots, and plant parasites were identified to genus in samples collected from 282 corn fields in 66 Nebraska counties in 2006. Population densities of one or more genera exceeded the lowest known damage thresholds for corn in 21% of the samples. The nematodes exceeding damage threshold population densities were spiral (Helicotylenchus spp.), stunt (Tylenchorhynchus spp.), dagger (Xiphinema spp.), lance (Hoplolaimus spp.) and lesion (Pratylenchus spp.). Spiral nematodes exceeded the damage threshold in 16% of samples. Lesion nematodes were extracted from 93% of root samples. Needle (Longidorus spp.), sting (Belonolaimus spp.) and stubby-root (Paratrichodorus spp.) nematodes were not extracted from any of the samples, despite having been previously identified on corn in Nebraska, and this is likely due to the late sampling dates and tendencies of these genera to migrate deeper into soil. More research is needed to determine the impact of nematodes on corn yield and interactions with other pathogens.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Pratylenchus (genus)	Maize/corn (Zea mays)	U.S.A. (mid N)
	Helicotylenchus (genus)	Maize/corn (Zea mays)	U.S.A. (mid N)
	Hoplolaimus (genus)	Maize/corn (Zea mays)	U.S.A. (mid N)
	Tylenchorhynchus (genus)	Maize/corn (Zea mays)	U.S.A. (mid N)
	Xiphinema (genus)	Maize/corn (Zea mays)	U.S.A. (mid N)