Distribution, virulence and genetic management of root lesion nematodes in the Pacific Northwest USA

Sheedy, J. G. and Smiley, R. W. and Thompson, A. L. and Easley, S. A. and Yan, G. (2008) Distribution, virulence and genetic management of root lesion nematodes in the Pacific Northwest USA. In: 5th International Congress of Nematology (5ICN 2008): Nematodes Down Under, 13-18 Jul 2008, Brisbane, Australia.

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Abstract

Root lesion nematodes (RLNs) have been identified in more than 90% of dryland cropping fields in the Pacific Northwest (PNW; Oregon, Washington, Idaho) USA. Pratylenchus
neglectus dominates but P. thornei and mixtures of both species occur commonly. Until recently, RLNs were only considered to cause significant yield loss in annual spring crops with traditional winter wheat-summer fallow rotations considered unsuitable for damaging RLN populations to develop. Recent research has shown that spring wheat and barley yields increased up to 98% and 15% respectively in response to aldicarb (4.2 kg a.i./ha) applied at planting in P. neglectus infested soil and 49% and 14% respectively in P. thornei infested soil. Yields of winter wheat and barley cultivars grown at the same locations also responded
up to 21% and 27% respectively in P. neglectus infested soil and 15% and 20% respectively in P. thornei infested soil. Glasshouse resistance screening showed that all tested PNW wheat cultivars were susceptible to both RLNs. Barley cultivars were generally more resistant than wheat cultivars but still moderately susceptible to P. neglectus and moderately resistant to moderately susceptible to P. thornei. Crop species identified as resistant to P. neglectus and/or P. thornei and suitable for crop rotation are either not well adapted to PNW cropping systems or have marginal economic viability. Breeding cereal cultivars with tolerance and resistance to RLNs has proven an effective management strategy in similar international situations and has been undertaken collaboratively in the PNW. Characterisation of commercial cultivars and advanced breeding lines for tolerance and resistance has begun as
has the introduction of elite sources of tolerance and resistance genes through a targeted crossing program. Molecular techniques are also being developed to identify RLNs to species from soil samples and resistance gene markers to assist breeding selection.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 18 Jun 2014 05:28
Last Modified: 15 May 2017 05:59
Uncontrolled Keywords: nematodes; wheat
Fields of Research : 06 Biological Sciences > 0604 Genetics > 060412 Quantitative Genetics (incl. Disease and Trait Mapping Genetics)
06 Biological Sciences > 0607 Plant Biology > 060702 Plant Cell and Molecular Biology
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8205 Winter Grains and Oilseeds > 820507 Wheat
URI: http://eprints.usq.edu.au/id/eprint/25317

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