Occurrence of root-lesion nematodes (Pratylenchus thornei and P. neglectus) and stunt nematode (Merlinius brevidens) in the northern grain region of Australia

Thompson, J. P. and Clewett, T. G. and Sheedy, J. G. and Reen, R. A. and O'Reilly, M. M. and Bell, K. L. (2010) Occurrence of root-lesion nematodes (Pratylenchus thornei and P. neglectus) and stunt nematode (Merlinius brevidens) in the northern grain region of Australia. Australasian Plant Pathology, 39 (3). pp. 254-264. ISSN 0815-3191


Pratylenchus thornei, P. neglectus and Merlinius brevidens were respectively present in soil from 67, 32 and 73% of 795 wheat fields sampled in the northern grain region of Australia. Population densities of P. thornei (31% of samples with >2000 nematodes/kg soil) were higher than those of P. neglectus (5%) or M. brevidens (11%). The mean proportion of plant-parasitic to total nematodes was 0.40. The incidence of P. thornei and P. neglectus increased significantly with the number of years that fields had been cropped since clearing natural vegetation. All three species occurred in soil samples across a wide range of texture and pH. Maximal incidence of P. thornei was in heavier textured soils (48% clay, 37% sand) than P. neglectus (39% clay, 45% sand). The incidence of M. brevidens increased linearly with increasing clay and decreasing sand contents. M. brevidens occurred in the pH range 6.0-9.5 and the Pratylenchus spp. in the range 6.5-9.5, with maximal incidence of P. neglectus at pH 8.2, P. thornei 8.4 and M. brevidens 8.8. Population densities of P. neglectus and especially non-parasitic nematodes were higher in the 015 cm soil layer than 15-30 cm. Overall the soil conditions of the northern grain region appear more favourable for P. thornei and M. brevidens than for P. neglectus

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2010 Australasian Plant Pathology Society. Published Version restricted in accordance with publisher copyright policy.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 28 Apr 2014 11:10
Last Modified: 08 Dec 2015 05:57
Uncontrolled Keywords: Geocenamus brevidens; Merlinius brevidens; nematoda; Pratylenchus; Pratylenchus neglectus; Pratylenchus thornei; Triticum aestivum;
Fields of Research : 06 Biological Sciences > 0603 Evolutionary Biology > 060307 Host-Parasite Interactions
05 Environmental Sciences > 0503 Soil Sciences > 050303 Soil Biology
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Socio-Economic Objective: D Environment > 96 Environment > 9604 Control of Pests, Diseases and Exotic Species > 960413 Control of Plant Pests, Diseases and Exotic Species in Farmland, Arable Cropland and Permanent Cropland Environments
Identification Number or DOI: 10.1071/AP09094
URI: http://eprints.usq.edu.au/id/eprint/25129

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