Modelling population densities of root-lesion nemaotde (Pratylenchus thornei) from soil profile temperatures to choose an optimum sowing date for wheat in a subtropical region
Article
Article Title | Modelling population densities of root-lesion nemaotde (Pratylenchus thornei) from soil profile temperatures to choose an optimum sowing date for wheat in a subtropical region |
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ERA Journal ID | 5309 |
Article Category | Article |
Authors | |
Author | Thompson, J. P. |
Journal Title | Field Crops Research |
Journal Citation | 183, pp. 50-55 |
Number of Pages | 6 |
Year | 2015 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0378-4290 |
1872-6852 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.fcr.2015.07.005 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0378429015300083 |
Abstract | The root-lesion nematode Pratylenchus thornei is widely distributed in many wheat growing countries and is particularly damaging to wheat in subtropical environments. This study aimed to investigate by simulation the effects of soil profile temperatures after different sowing dates on reproduction of Pratylenchus thornei in susceptible and moderately resistant wheat cultivars in the subtropical grain region of eastern Australia. A quadratic regression model relating P. thornei population densities to thermal time was produced from experimental data for susceptible, intolerant wheat cv. Gatcher and moderately resistant, tolerant wheat cv. GS50a, and applied to soil profile temperatures after four sowing dates from 25 April to 24 July. Simulated final population densities of P. thornei throughout the soil profile to 60 cm depth were least at 18 weeks after 25 May sowing. For Gatcher and GS50a respectively there were 5.7 and 3.5 times as many nematodes after 24 July sowing as after 25 May sowing, 2.0 and 1.6 after 24 June, and 1.4 and 1.3 after 25 April sowings. GS50a had 78% (May) to 86% (July) fewer nematodes in the soil profile than Gatcher. These simulations indicated that an optimum sowing date can be chosen to limit P. thornei reproduction in both susceptible and moderately resistant wheat cultivars. Gatcher had a 61% increase in measured grain yield and GS50a had an 8% increase from sowing in late May rather than in the third week of June. Sowing wheat at an optimum time in subtropical grain regions to ensure roots grow in cool soil can be a useful component of integrated management by reducing the rate of P. thornei reproduction and increasing grain yield. |
Keywords | Pratylenchus thornei, wheat sowing date, cultivar resistance, temperature model, thermal time, soil depth |
ANZSRC Field of Research 2020 | 300409. Crop and pasture protection (incl. pests, diseases and weeds) |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Centre for Crop Health |
Institution of Origin | University of Southern Queensland |
Funding source | Grant ID GRDC |
https://research.usq.edu.au/item/q3357/modelling-population-densities-of-root-lesion-nemaotde-pratylenchus-thornei-from-soil-profile-temperatures-to-choose-an-optimum-sowing-date-for-wheat-in-a-subtropical-region
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