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Can crop rotation reduce inoculum of the carrot pathogen Alternaria radicina?

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dc.contributor.author Hampton, John G. en
dc.contributor.author Trivedi, R. S. en
dc.contributor.author Townshend, J. M. en
dc.date.accessioned 2017-05-18T03:16:49Z
dc.date.issued 2012 en
dc.identifier.citation Hampton, J.G., Trivedi, R.S., & Townshend, J. M. (2012). Can crop rotation reduce inoculum of the carrot pathogen Alternaria radicina? Agronomy New Zealand, 42,155-162. en
dc.identifier.issn 0110-6589 en
dc.identifier.uri https://hdl.handle.net/10182/8095
dc.description.abstract The fungal pathogen Alternaria radicina causes pre- and post-emergence damping off, leaf and umbel blight and black rot of carrot. It is seed and soil-borne, and in mid-Canterbury, soil populations ranging from 33-223 colony forming units (CFU)/g soil have been recorded. How long A. radicina remains viable in New Zealand soils was not known. Fields which had last produced a carrot seed crop from twelve down to one year previously were identified and their A. radicina population determined. The pathogen was still present six years after a carrot seed crop had been harvested, but was absent from soils where a carrot seed crop had been harvested seven or more years previously, suggesting that a seven to eight year gap between carrot seed crops in the same field would be required to avoid disease problems from this source. In a pot trial, A. radicina inoculum was reduced by 29% (from 240 CFU/g) after four and a half months in the presence of wheat plants, and was also significantly reduced in the presence of barley and faba bean, but not perennial ryegrass or pea. It is possible that root exudates contain antifungal compounds, but this was not determined. Whether growing the non-host crops wheat, barley or faba bean after carrot can reduce A. radicina soil-borne inoculum requires further investigation. en
dc.format.extent 155-162 en
dc.language.iso en en
dc.publisher Agronomy Society of New Zealand en
dc.relation The original publication is available from - Agronomy Society of New Zealand - https://www.agronomysociety.org.nz/321804/ en
dc.rights © Copyright The Authors en
dc.source 42nd Agronomy Society Conference en
dc.subject Daucas carota en
dc.subject soil-borne inoculum en
dc.subject carrot seed production en
dc.subject root exudates en
dc.subject wheat en
dc.subject barley en
dc.subject faba bean en
dc.title Can crop rotation reduce inoculum of the carrot pathogen Alternaria radicina? en
dc.type Conference Contribution - Published
lu.contributor.unit Lincoln University en
lu.contributor.unit Bio-Protection Research Centre en
dc.subject.anzsrc 070308 Crop and Pasture Protection (Pests, Diseases and Weeds) en
dc.subject.anzsrc 060505 Mycology en
dc.subject.anzsrc 050303 Soil Biology en
dc.subject.anzsrc 070302 Agronomy en
dc.subject.anzsrc 060704 Plant Pathology en
dc.subject.anzsrc 0703 Crop And Pasture Production en
dc.relation.isPartOf Agronomy New Zealand en
pubs.finish-date 2012-11-22 en
pubs.organisational-group /LU
pubs.organisational-group /LU/BPRC
pubs.publication-status Published en
pubs.publisher-url https://www.agronomysociety.org.nz/321804/ en
pubs.start-date 2012-11-20 en
pubs.volume 42 en
lu.identifier.orcid 0000-0003-3449-825X
lu.subtype Conference Paper en


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