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

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Thompson, J. P., Clewett, T. G., Sheedy, J. G., Reen, R. A., 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 1448-6032

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Article Link: https://doi.org/10.1071/AP09094

Publisher URL: https://doi.org/10.1071/AP09094

Abstract

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 0–15cm 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.

Item Type:Article
Corporate Creators:Department of Agriculture and Fisheries, Queensland
Business groups:Crop and Food Science
Subjects:Plant culture > Field crops > Grain. Cereals
Plant pests and diseases > Plant pathology
Live Archive:13 Feb 2024 05:19
Last Modified:13 Feb 2024 05:19

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