<p>The purpose of the research has been to further the understanding of the seasonal occurrence of tomato spotted wilt virus (TSWV) and the insect vector, Frankliniella fusca, in relation to North Carolina peanut production. Emphasis was placed on 3 Virginia-type peanut genotypes, NC-9, NC-V11, and NC-12C, which were included in field and greenhouse experiments to determine relative disease and thrips levels and their interactions. These are components of a larger strategic goal to develop management strategies that can minimize future impacts of TSWV and be compatible with peanut production in North Carolina. Research was conducted to determine the winter, spring, and summer occurrence of F. fusca in NC peanut fields. Thrips movement in spring was significantly influenced by prevailing wind direction. No thrips were collected on sticky traps during days when maximum temperature did not exceed 18.7 C. F. fusca, caged with TSWV infected peanut plants in August, 1996 and sampled in March, 1997, were analyzed for the presence of TSWV by ELISA. A single thrips tested positive for the virus. In another experiment, three Virginia-type peanut genotypes were monitored for the incidence of TSWV symptoms and the presence of F. fusca at 3 locations in NC's peanut producing area. Overall disease incidence at the 3 locations was 6%. Of the genotypes, NC-9 ranked the highest in disease incidence (7%), followed by the genotypes NC-12C (6%), and NC-V11 (5%). F. fusca counts were greatest on NC-V11, followed by NC-9 and NC-12C. A comparison of the survival and reproductive success of F. fusca on TSWV infected and uninfected plants of the 3 genotypes was conducted under greenhouse conditions in NC. Effects of genotype and virus by genotype interaction were not significant. However, TSWV infected plants had significantly fewer adult and larval F. fusca than did uninfected plants.<P>
| Identifer | oai:union.ndltd.org:NCSU/oai:NCSU:etd-19990415-075759 |
| Date | 21 April 1999 |
| Creators | Garcia, Lloyd Edward |
| Contributors | Rick L. Brandenburg, George G. Kennedy, Julius R. Bradley, Jack R. Bailey |
| 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-19990415-075759 |
| 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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