EFFECT OF SOIL CATIONS ON THE DISTRIBUTION OF PHYMATOTRICHUM OMNIVORUM (SHEAR) DUGGAR

Persistent Link:
http://hdl.handle.net/10150/282011
Title:
EFFECT OF SOIL CATIONS ON THE DISTRIBUTION OF PHYMATOTRICHUM OMNIVORUM (SHEAR) DUGGAR
Author:
Mueller, James Paul
Issue Date:
1981
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The occurrence of the cotton root rot fungus, Phymatotrichum omnivorum (Shear) Duggar, in sharply defined, localized areas in certain fields led to the suggestion that there may be a specific soil chemical factor which limits the spread of the fungus. The available sodium, potassium, calcium, and magnesium contents of infested and adjacent noninfested soils in 13 fields were determined and compared. At seven sites, there were no significant differences in cation contents of infested and adjacent noninfested areas (p = 0.05). Available sodium levels were higher in infested areas at three sites, and higher in noninfested areas at three sites. Potassium and calcium levels were higher in the infested area at one site, and higher in the noninfested areas at two sites. Magnesium levels were higher in the noninfested areas at three sites. Contrary to previous reports, the fungus was found to cause severe disease in soils with available sodium contents as high as 4.2 milliequivalents per 100 g soil. Applications of sodium chloride at rates ranging from 1800 to 4000 kg/ha did not reduce disease severity or increase yield significantly in ten field trials.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Cotton root rot.; Cotton -- Diseases and pests.; Soil ecology -- Arizona.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Plant Pathology
Degree Grantor:
University of Arizona
Advisor:
Hine, Richard B.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleEFFECT OF SOIL CATIONS ON THE DISTRIBUTION OF PHYMATOTRICHUM OMNIVORUM (SHEAR) DUGGARen_US
dc.creatorMueller, James Paulen_US
dc.contributor.authorMueller, James Paulen_US
dc.date.issued1981en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe occurrence of the cotton root rot fungus, Phymatotrichum omnivorum (Shear) Duggar, in sharply defined, localized areas in certain fields led to the suggestion that there may be a specific soil chemical factor which limits the spread of the fungus. The available sodium, potassium, calcium, and magnesium contents of infested and adjacent noninfested soils in 13 fields were determined and compared. At seven sites, there were no significant differences in cation contents of infested and adjacent noninfested areas (p = 0.05). Available sodium levels were higher in infested areas at three sites, and higher in noninfested areas at three sites. Potassium and calcium levels were higher in the infested area at one site, and higher in the noninfested areas at two sites. Magnesium levels were higher in the noninfested areas at three sites. Contrary to previous reports, the fungus was found to cause severe disease in soils with available sodium contents as high as 4.2 milliequivalents per 100 g soil. Applications of sodium chloride at rates ranging from 1800 to 4000 kg/ha did not reduce disease severity or increase yield significantly in ten field trials.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectCotton root rot.en_US
dc.subjectCotton -- Diseases and pests.en_US
dc.subjectSoil ecology -- Arizona.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplinePlant Pathologyen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorHine, Richard B.en_US
dc.identifier.proquest8126179en_US
dc.identifier.oclc8376154en_US
dc.identifier.bibrecord.b13780189en_US
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