<p>Fusarium ear rot and fumonisin contamination are serious problems for North Carolina maize growers. With the discovery of fumonisin toxicity to animals and humans, and the finding that no maize genotypes are resistant to Fusarium verticillioides infection or fumonisin contamination, management strategies for limiting fungal and toxin contamination of harvested grain are necessary. Maize ears were harvested weekly for 14 or 15 weeks after pollination and assayed for percent kernel infection and fumonisin contamination. Kernel infection and fumonisin contamination occurred before kernel maturity and increased throughout the season, with kernel infection peaking 7 to 10 weeks after pollination. Data from this experiment and data from grower?s fields indicate that early harvest is necessary to limit rotten kernels and fumonisin in harvested grain.Difficulty in identifying resistant genotypes has limited the development of more resistant hybrids. Many inoculation techniques have been employed to reproduce Fusarium ear rot with marginal results, primarily because differentially resistant and susceptible hybrids were not used to identify promising inoculation techniques. In my study, ears were treated with different inoculation techniques to reproduce ear rot and fumonisin contamination in hybrids of known resistance to Fusarium ear rot. Two inoculation techniques, Pinbar and Silk Channel, were able to separate hybrids on visible ear rot and fumonisin contamination. Addition of inoculum to ears appears important for screening hybrids for resistance to Fusarium ear rot and fumonisin contamination.<P>
| Identifer | oai:union.ndltd.org:NCSU/oai:NCSU:etd-20010718-161312 |
| Date | 20 July 2001 |
| Creators | Bush, Brian Joseph |
| Contributors | Gary A. Payne, Martin L. Carson, Winston M. Hagler, James B. Holland |
| Publisher | NCSU |
| Source Sets | North Carolina State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://www.lib.ncsu.edu/theses/available/etd-20010718-161312 |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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