Suppression of Wheat Growth and Yield by Pratylenchus neglectus in the Pacific Northwest

Plant Disease
Richard W SmileySandra A Easley

Abstract

Many wheat (Triticum aestivum) fields planted annually in the Pacific Northwest are infested by high populations of the lesion nematode, Pratylenchus neglectus. Spring wheat cultivars varying in tolerance and resistance to P. neglectus were treated or not treated with aldicarb to examine relationships between the nematode and growth and yield of annual direct-seeded (no-till) wheat. Increasing initial density of P. neglectus in soil was more strongly associated with declining growth and yield of intolerant (Machete and Spear) than moderately tolerant (Frame and Krichauff) cultivars. Yield suppression by P. neglectus was generally 8 to 36% for intolerant cultivars, but reached 71% in soil also harboring Heterodera avenae, Rhizoctonia solani AG-8, and Gaeumannomyces graminis var. tritici. Intolerant cultivars had lower yields than Krichauff in rainfed but not in irrigated experiments. Density of P. neglectus in mature roots was generally lower for moderately resistant Krichauff than for susceptible Machete and Spear. Aldicarb improved yields in irrigated but not in rainfed experiments, and increased plant height and reduced variability in tiller height, canopy temperature, and density of P. neglectus in roots. This is the first r...Continue Reading

References

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Jan 1, 1984·European Surgical Research. Europäische Chirurgische Forschung. Recherches Chirurgicales Européennes·N N ZwetnowK Rootwelt
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Citations

Oct 11, 2019·Plant Disease·Riyadh T Al-KhafajiAlan T Dyer
Mar 1, 2009·Plant Disease·Richard W Smiley, Stephen Machado
Oct 1, 2014·Plant Disease·Richard W SmileyJennifer A Gourlie
Oct 23, 2010·The Journal of Animal Ecology·Martijn L VandegehuchteDries Bonte

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