Title page for ETD etd-03212001-144228


Type of Document Dissertation
Author McDonald, Sharon Angella
Author's Email Address shmcdona@vt.edu
URN etd-03212001-144228
Title Epidemiology, Aphid Vectors, Impact and Management of Tobacco Etch Potyvirus in Hot Peppers in Jamaica
Degree PhD
Department Entomology
Advisory Committee
Advisor Name Title
Nault, Brian A. Committee Co-Chair
Tolin, Sue A. Committee Co-Chair
Mack, Timothy P. Committee Member
Nault, Lowell R. Committee Member
Pfeiffer, Douglas G. Committee Member
Keywords
  • seasonal abundance
  • yield
  • reflective mulch
  • geostatistics
  • stylet oil
  • time of infection
Date of Defense 2001-02-22
Availability unrestricted
Abstract
Production of hot peppers, Capsicum spp., in Jamaica is constrained by the aphid-transmitted potyviruses, tobacco etch virus (TEV) and potato virus Y (PVY). The virus epidemiology was not understood and no effective virus management system existed for these viruses. This study sought to identify possible management strategies for aphid-transmitted viruses of hot peppers in Jamaica, using TEV and Capsicum chinense, var. 'Scotch Bonnet' and 'West Indian Red', as models.

Field spread of TEV to pepper was mainly by secondary spread from primary infections. Secondary infections were spatially correlated to primary infections for up to 25 meters. Natural infections of TEV were associated with aphid flight activity. Over 30 species of aphids were collected on pepper farms in St. Catherine parish. These aphids included five known vectors of TEV, Aphis gossypii Glover, A. craccivora Koch, A. spiraecola Patch, Lipaphis erysimi Hille Ris Lambers and M. persicae (Sulzer), and 12 new records for Jamaica, Aphis amaranthi Holman, Brachycaudus helichrysi (Kaltenbach),Capitophorus hippophaes (Walker), Geopemphigus floccosus (Moreira), Hysteroneura setariae (Thomas), Lipaphis erysimi Hille Ris Lambers, Rhopalosiphum padi (Linnaeus), Schizaphis graminum (Rondani), Schizaphis rotundiventris (Signoret), Trichosiphonaphis poligoni (van der Goot), Uroleucon ambrosiae complex (Thomas) and Uroleucon pseudoambrosiae (Olive). A. amaranthi and U. ambrosiae were associated with TEV spread. Weeds on and near farms influenced the abundance and species of aphids captured.

West Indian Red pepper showed tolerance to TEV. Scotch Bonnet pepper yield reduction was greater if plants were infected with TEV during the vegetative stage through flower initiation rather than after the start of fruit set. Stylet oil and reflective mulch used together delayed the incidence of TEV in pepper plots for over two months. TEV management programs should aim to delay the virus from infecting peppers during the first two months after transplanting. A risk analysis is proposed for management of TEV and other aphid-borne viruses.

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  CHAPTER_1.pdf 143.42 Kb 00:00:39 00:00:20 00:00:17 00:00:08 < 00:00:01
  CHAPTER_2.pdf 306.04 Kb 00:01:25 00:00:43 00:00:38 00:00:19 00:00:01
  CHAPTER_3.pdf 165.18 Kb 00:00:45 00:00:23 00:00:20 00:00:10 < 00:00:01
  CHAPTER_4.pdf 148.47 Kb 00:00:41 00:00:21 00:00:18 00:00:09 < 00:00:01
  CHAPTER_5.pdf 50.48 Kb 00:00:14 00:00:07 00:00:06 00:00:03 < 00:00:01
  CHAPTER_6.pdf 25.96 Kb 00:00:07 00:00:03 00:00:03 00:00:01 < 00:00:01
  FRONT_MATTER.pdf 39.56 Kb 00:00:10 00:00:05 00:00:04 00:00:02 < 00:00:01
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