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

Year: 2008
Type: article
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 \ncultivars 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 \n10kg/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 \nhigher 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. \nResults 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.
Language: English
Subfield: Plant Science
Open Access status: green
OpenAlex ID: W80805891
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