Incidence and Management of Seed Transmission of Cylindrocladium Black Rot of Peanut in Virginia

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dc.contributor.authorGlenn, Deborah Leaen
dc.contributor.committeecochairStipes, R. Jayen
dc.contributor.committeecochairPhipps, Patrick M.en
dc.contributor.committeememberBaudoin, Antonius B.en
dc.contributor.committeememberMozingo, R. Waltonen
dc.contributor.departmentPlant Pathology, Physiology, and Weed Scienceen
dc.date.accessioned2014-03-14T20:32:38Zen
dc.date.adate2001-03-20en
dc.date.available2014-03-14T20:32:38Zen
dc.date.issued2001-03-01en
dc.date.rdate2002-03-20en
dc.date.sdate2001-03-14en
dc.description.abstractSeed transmission of <i>Cylindrocladium parasiticum</i> was investigated as a possible explanation for the higher-than-expected incidence of Cylindrocladium black rot (CBR) of peanut in fields fumigated with metam sodium. Sixty-three commercial seed lots from Virginia production fields were examined for the presence of seed with speckled testae, a symptom of seed infection by <i>C. parasiticum</i>. Speckled seed was present in conditioned seed lots in 1998, 1999, and 2000 at an average rate of 1%. Soon after pods were harvested, the fungus was recovered from speckled seed at high frequencies. During winter seed storage, pathogen survival remained high in seed stored at -13 and 4 C, but declined in some seed stored at 15 C and ambient temperatures. Speckled and normal seed with and without fungicide treatment was planted in steam-treated soil in the greenhouse and metam-treated field plots in 1999 and 2000. Speckled seed treated with captan + pentachloronitrobenzene (pcnb) + carboxin transmitted the pathogen to emerging plants in the greenhouse and field. Transmission levels depended on the amount of viable inoculum present in seed at the time of planting. In the field, yield losses were significant when 20% or more of the seed planted was speckled. The low incidence of speckled seed in commercial seed lots would not result in a loss of yield for growers, but may contribute to disease spread. Testing of additional seed treatment fungicides indicated that fludioxonil, tebuconazole, and thiram may offer the best protection against disease spread from seed transmission of <i>C. parasiticum</i>.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-03142001-092102en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03142001-092102/en
dc.identifier.urihttp://hdl.handle.net/10919/31471en
dc.publisherVirginia Techen
dc.relation.haspart15-CH4Table9.pdfen
dc.relation.haspart23-CH4Fig7.pdfen
dc.relation.haspart10-CH3Table4.pdfen
dc.relation.haspart17-CH2Fig1.pdfen
dc.relation.haspart03-Chapter2.pdfen
dc.relation.haspart09-CH2Table3.pdfen
dc.relation.haspart13-CH4Table7.pdfen
dc.relation.haspart07-CH2Table1.pdfen
dc.relation.haspart18-CH2Fig2.pdfen
dc.relation.haspart11-CH3Table5.pdfen
dc.relation.haspart16-CH4Table10.pdfen
dc.relation.haspart14-CH4Table8.pdfen
dc.relation.haspart08-CH2Table2.pdfen
dc.relation.haspart24-CH4Fig8.pdfen
dc.relation.haspart19-CH3Fig3.pdfen
dc.relation.haspart01-Thesis-Intro.pdfen
dc.relation.haspart04-Chapter3.pdfen
dc.relation.haspart22-CH4Fig6.pdfen
dc.relation.haspart02-Chapter1.pdfen
dc.relation.haspart05-Chapter4.pdfen
dc.relation.haspart12-CH4Table6.pdfen
dc.relation.haspart21-CH4Fig5.pdfen
dc.relation.haspart06-VITA.pdfen
dc.relation.haspart20-CH3Fig4.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectArachis hypogaeaen
dc.subjectCalonectria ilicicolaen
dc.subjectCylindrocladium crotalariaeen
dc.subjectCylindrocladium parasiticumen
dc.subjectseed treatment fungicidesen
dc.titleIncidence and Management of Seed Transmission of Cylindrocladium Black Rot of Peanut in Virginiaen
dc.typeThesisen
thesis.degree.disciplinePlant Pathology, Physiology, and Weed Scienceen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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