Apr 4, 2014 - 'Morton'. Good hosts of P. neglectus but not of P. thornei included 10. Brassica spp. (5 canola, 2 mustard, and 3 camelina cultivars), chickpea.
Selected Pacific Northwest Crops as Hosts of Pratylenchus neglectus and P. thornei Richard W. Smiley, Professor, Guiping Yan, Research Associate, and Jennifer A. Gourlie, Faculty Research Assistant, Oregon State University, Columbia Basin Agricultural Research Center, P.O. Box 370, Pendleton, OR 97801
Abstract Smiley, R. W., Yan, G. P., and Gourlie, J. A. 2014. Selected Pacific Northwest crops as hosts of Pratylenchus neglectus and P. thornei. Plant Dis. 98:1341-1348. Thirty crop species and cultivars were assayed in the greenhouse for efficiency as hosts of Pratylenchus neglectus and P. thornei. Hosting ability ratings were assigned using the ratio of final versus initial nematode density and also by comparing the final nematode density to that of a susceptible wheat control. Good hosts of both Pratylenchus spp. included oat ‘Monida’, chickpea ‘Myles’, and lentil ‘Athena’ and ‘Morton’. Good hosts of P. neglectus but not of P. thornei included 10 Brassica spp. (5 canola, 2 mustard, and 3 camelina cultivars), chickpea
‘Sierra’, sudangrass ‘Piper’, and sorghum/sudangrass hybrid ‘Greentreat Plus’. Good hosts of P. thornei but not of P. neglectus included lentil ‘Skyline’ and pea ‘Granger’, ‘Journey’, and ‘Universal’. Poor or minor hosts of both Pratylenchus spp. included chickpea ‘Dwelley’, pea ‘Badminton’, safflower ‘Gila’, ‘Girard’, and ‘KN 144’, sunflower ‘2PD08’, flax ‘Pembina’, eastern gamagrass ‘Pete’, and switchgrass ‘Blackwell’. Results of these assays will provide guidance for improving crop rotation and cultivar selection efficiencies.
Root-lesion nematodes (Pratylenchus spp.) are present in 90% of the fields in low-precipitation regions of the Pacific Northwest (PNW; southern Idaho, eastern Oregon, and eastern Washington) (13,42,47). The most prevalent species in rainfed production systems are P. neglectus (Rensch) Filipjev Schuurmanns & Stekhoven and P. thornei Sher & Allen. These two species often occur individually, but they also occur as mixtures of species in many fields. P. neglectus and P. thornei have greater deleterious effects on root growth than on foliar growth, particularly when plants become subjected to drought stress (3,14,50,51). Rainfed wheat (Triticum aestivum L.) yields in low-precipitation regions (F CV (%) P. thornei Unplanted soil, inoculated Susceptible wheat Susceptible wheat Resistant wheat Eastern gamagrass Switchgrass Sudangrass Oats Sorghum/sudangrass cross P>F CV (%)
2011 Cultivar
BTMw
… Louise Otis AUS28451 Pete Blackwell Piper Monida Greentreat Plus
24 c 17,580 a 23,599 a 146 bc 8c 9c 2,004 ab 8,714 a 164 bc
