Crop rotation to replace nematicide treatments for assessing chickpea varietal tolerance to Pratylenchus thornei

Reen, R. A. and Clewett, T. G. and Thompson, J. P. (2008) Crop rotation to replace nematicide treatments for assessing chickpea varietal tolerance to Pratylenchus thornei. In: 5th International Congress of Nematology (5ICN 2008): Nematodes Down Under, 13-18 Jul 2008, Brisbane, Australia.

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Abstract

Field trials were conducted to determine if crop rotation would suppress soil populations of Pratylenchus thornei and eliminate the use of nematicde plots when assessing chickpea
cultivars for tolerance. Assessing yield response to P. thornei is difficult due to problems associated with nematicide penetration in the sub-soil. In year one, plot treatments consisted of canola, linseed, canaryseed, wheat and bare fallow, applied with or without aldicarb at
10kg/hectare in a three randomized block design. The following year the same plots were recropped with four chickpea cultivars and one intolerant wheat cultivar and aldicarb re-applied to the nematicide plots. Results from the pre-crops revealed wheat produced significantly
higher nematode numbers throughout the soil profile than the other treatments. P. thornei populations peaked at depths of 45-60cm but nematicide was only effective down to depths of 30cm. Canola and fallow resulted in significantly lower populations of mycorrhizal spores than wheat. Canaryseed resulted in low nematode numbers in contrast to wheat and high mycorrhizal spores comparable to wheat so it was selected as the best control treatment for future use. All pre-crop treatments had similar moisture down to depths of 60cm. Chickpea yields on pre-cropped canary plots increased by 10-30% compared to yields on pre-cropped wheat plots. Nematicide on canary plots gave no additional yield of the following chickpea.
Results demonstrated that using resistant canary and susceptible wheat plots is an effective alternative to plus nematicide and minus nematicide treatments when assessing tolerance in chickpea cultivars. This methodology has been successfully implemented in subsequent trials.


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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 06:00
Uncontrolled Keywords: nematodes; field trials; Darling Downs; chickpea
Fields of Research : 07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070108 Sustainable Agricultural Development
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: E Expanding Knowledge > 97 Expanding Knowledge > 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
URI: http://eprints.usq.edu.au/id/eprint/25318

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