Title: Corn stalk rot incidence, etiology, and control in Florida
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Permanent Link: http://ufdc.ufl.edu/UF00099153/00001
 Material Information
Title: Corn stalk rot incidence, etiology, and control in Florida
Physical Description: v, 107 leaves : ill. (some col.) ; 28 cm.
Language: English
Creator: Young, Thomas R., 1946- ( Dissertant )
Kucharek, Thomas A. ( Thesis advisor )
Roberts, Daniel A. ( Reviewer )
Stall, Robert E. ( Reviewer )
Rimbrough, James W. ( Reviewer )
Sitchell, David J. ( Reviewer )
Browning, C. B. ( Degree grantor )
Publisher: University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 1975
Copyright Date: 1975
 Subjects
Subjects / Keywords: Plant Pathology thesis Ph. D
Corn -- Diseases and pests   ( lcsh )
Dissertations, Academic -- Plant Pathology -- UF
Genre: bibliography   ( marcgt )
non-fiction   ( marcgt )
Spatial Coverage: United States--Florida
 Notes
Abstract: Associations of fungi in stalks and roots of hybrid field corn occurred in a succession of five communities. These communities were associated with particular growth stages of the plants sampled. The first community, which consisted of Pyrenochaetae t err est r is , Fu s a r ium s o 1 a n i , Fus ariuni lateritium, Rhizopus sp. , and Penicillium spp. , appeared in the seedling stage, reached its maximum isolation frequency by silking and by the full dent, stage was no longer recovered. The second community, consisting of Trichoderma viride and Fusariuin monili forme , appeared in the seedling stage and was isolated with increasing frequency throughout the remainder of the season. The third community, composed of Curvularia sp. and Mortierella sp. , appeared at silking, reached its maximum frequency by the dough stage, and was notrecovered after plants reached physiological maturity. The fourth community, which comprised Macrophomina phaseolina , Rhizoct onia solan i , and S clerotium rolfsi i , appeared at the dough stage, increased in frequency up to physiological maturity and gradually declined to harvest time (151 kernel moisture, 175 days after planting). The final community to appear was composed of Helminthosporium rostratum and Diplodia maydis . It appeared in the dough stage and increased in frequency until at harvest it was nearly as abundant as the second community. The succession of fungi in corn stalks and roots could not be directly attributed to any of the following factors: seasonal fluctuations in temperature or moisture; effect of sucrose concentration on fungal growth and development; changes in 6-methoxy 2 (3) -benzoxazolinone (MBOA) concentration; or the relative saprophytic ability of the fungi associated with corn stalks and roots. Virulence tests indicated that the fungal complex of stalk rotting pathogens included F. monili forme , H. rostratum , and D. maydis . In addition, T. viride and M. phaseolina , which were weak pathogens in living plants, were capable of extensive saprophytic decay activity in dead tissue. Corn may be invaded by H. rostratum late in the season when airborne spores lodge between stalks and sheaths, germinate and penetrate the stalks. Helminthosporium rostratum and D. maydis were unable to survive in stalk residue buried in the field for 110 days, whereas F. moniliforme and T. viride were able to survive. In Florida, the losses caused by stalk rot were estimated to be 8.5% of the value of the crop, or nearly three million dollars annually. Control of this syndrome through resistant varieties may be feasible since resistance to F_. moniliforme and H. rostratum was demonstrated in some commercial hybrids and in some inbred breeding lines.
Statement of Responsibility: by Thomas R. Young.
Thesis: Thesis--University of Florida.
Bibliography: Bibliography: leaves 88-97.
General Note: Typescript.
General Note: Vita.
 Record Information
Bibliographic ID: UF00099153
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: alephbibnum - 000355564
oclc - 02274142
notis - ABZ3805

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