Dynamics of soybean rust epidemics in sequential plantings of soybean cultivars in Nigeria

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cg.authorship.typesCGIAR and advanced research instituteen
cg.contributor.affiliationInternational Institute of Tropical Agricultureen
cg.contributor.affiliationNorth Carolina State Universityen
cg.contributor.affiliationUniversity of Illinoisen
cg.contributor.affiliationUnited States Department of Agricultureen
cg.coverage.countryNigeria
cg.coverage.iso3166-alpha2NG
cg.coverage.regionAfrica
cg.coverage.regionWestern Africa
cg.howPublishedFormally Publisheden
cg.identifier.doihttps://doi.org/10.1094/pdis-06-10-0436en
cg.isijournalISI Journalen
cg.issn0191-2917en
cg.issue1en
cg.journalPlant Diseaseen
cg.reviewStatusPeer Reviewen
cg.subject.iitaGRAIN LEGUMESen
cg.subject.iitaPLANT DISEASESen
cg.subject.iitaSOYBEANen
cg.volume95en
dc.contributor.authorTwizeyimana, M.en
dc.contributor.authorOjiambo, P.en
dc.contributor.authorHartman, G.L.en
dc.contributor.authorBandyopadhyay, Ranajiten
dc.date.accessioned2017-05-22T12:47:04Zen
dc.date.available2017-05-22T12:47:04Zen
dc.identifier.urihttps://hdl.handle.net/10568/81156
dc.titleDynamics of soybean rust epidemics in sequential plantings of soybean cultivars in Nigeriaen
dcterms.abstractSoybean rust, caused by Phakopsora pachyrhizi, is an important foliar disease of soybean. Disease severity is dependent on several environmental factors, although the precise nature of most of these factors under field conditions is not known. To help understand the environmental factors that affect disease development, soybean rust epidemics were studied in Nigeria by sequentially planting an early-maturing, highly susceptible cultivar, TGx 1485-1D, and a late-maturing, moderately susceptible cultivar, TGx 1448-2E, at 30- to 45-day intervals from August 2004 to September 2006. Within each planting date, disease onset occurred earlier on TGx 1485-1D than on TGx 1448-2E, and rust onset was at least 20 days earlier on soybean planted between August and October than on soybean planted between November and April. The logistic model provided a better description of the temporal increase in rust severity than the Gompertz model. Based on the logistic model, the highest absolute rates of disease increase were observed on soybean planted in September 2006 and October 2004 for TGx 1485-1D and TGx 1448-2E, respectively. Disease severity as measured by the relative area under disease progress curve (RAUDPC) was significantly (P < 0.05) negatively correlated with evaporation (r = –0.73), solar radiation (r = –0.59), and temperature (r = –0.64) but positively correlated with urediniospore concentration (r = 0.58). Planting date and soybean cultivar significantly (P < 0.05) affected disease severity, with severity being higher on soybean crops planted during the wet season than those planted in the dry season. Within the wet season, planting in May and July resulted in a significantly (P < 0.05) lower RAUDPC than planting between August and October. Yields were significantly (P < 0.001) related to RAUDPC during the wet season, whereby an increase in RAUDPC resulted in a linear decrease in yield. This study suggests that selection of planting date could be a useful cultural practice for reducing soybean rust.en
dcterms.accessRightsLimited Access
dcterms.audienceScientistsen
dcterms.bibliographicCitationTwizeyimana, M., Ojiambo, P., Hartman, G.L. & Bandyopadhyay, R. (2011). Dynamics of soybean rust epidemics in sequential plantings of soybean cultivars in Nigeria. Plant Disease, 95(1), 43-50.en
dcterms.extent43-50en
dcterms.issued2011-01
dcterms.languageen
dcterms.publisherScientific Societiesen
dcterms.subjectsoybean rusten
dcterms.subjectsoybean cultivarsen
dcterms.subjectphakopsora pachyrhizien
dcterms.subjectplanting dateen
dcterms.typeJournal Article

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