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Field distribution and disease incidence of tomato chlorotic spot virus, an emerging virus threatening tomato production in South Florida

  • Bindu PoudelEmail author
  • Osama A. Abdalla
  • Qingchun Liu
  • Qingren Wang
  • Eugene McAvoy
  • Dakshina Seal
  • Kai-Shu Ling
  • Margaret McGrath
  • Shouan ZhangEmail author
Original Article
  • 7 Downloads

Abstract

Tomato chlorotic spot tospovirus is a species of the genus Orthotospovirus, family Tospoviridae. One of the causal agents of tomato spotted wilt, tomato chlorotic spot virus (TCSV) was first detected in tomato and bell pepper in south Florida in 2012 and is considered an emerging virus to the region. It has caused significant losses to tomato growers in the region since 2014. Field surveys were conducted in tomato fields in Miami-Dade County in the 2015–2016 and 2016–2017 growing seasons. Results of the surveys indicate that TCSV is the predominant virus among the three known orthotospoviruses [tomato spotted wilt virus (TSWV), groundnut ringspot virus (GRSV) and TCSV] present in south Florida. TCSV was detected in 43.8% of symptomatic samples collected in the 2016–2017 season. Mixed infection with two orthotospoviruses ranged from 2.8–6.3%, and 2.0% of the symptomatic samples were infected with all three viruses. The distribution pattern of TCSV-infected plants in a commercial tomato field in Homestead, FL suggested that the initial source of TCSV could be ornamental crops in adjacent nurseries. Up to 56.0% of the tomato plants with symptoms were observed in this field adjacent to ornamental nurseries, whereas the incidence gradually decreased to zero in the other side of the same field. Phylogenetic analysis using partial sequences of TCSV isolates revealed genetic diversity of 2.0% or less at the nucleotide level.

Keywords

Disease incidence Field distribution Groundnut ringspot tospovirus Phylogenetic analysis Tomato chlorotic spot tospovirus Tomato spotted wilt tospovirus 

Notes

Acknowledgements

This study was supported by the USDA National Institute of Food and Agriculture Crop Protection and Pest Management (CPPM) project (Award No. 2015-70006-24165) and the Florida Department of Agriculture and Consumer Services Specialty Crop Block Grant project (Award No. USDA-AMS-SCBGP-2015) to Shouan Zhang. We thank the tomato growers in Miami-Dade County for kindly allowing us to survey the tomato fields in this study. We also thank Cliff Martin for his assistance in identifying the weed species tested.

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Copyright information

© Sociedade Brasileira de Fitopatologia 2019

Authors and Affiliations

  1. 1.Tropical Research and Education CenterUniversity of FloridaHomesteadUSA
  2. 2.Yuma Ag CenterUniversity of ArizonaYumaUSA
  3. 3.Department of Plant Pathology, Faculty of AgricultureAssiut UniversityAssiutEgypt
  4. 4.UF/IFAS Miami-Dade County ExtensionHomesteadUSA
  5. 5.UF/IFAS Hendry County ExtensionLaBelleUSA
  6. 6.USDA-ARS, U.S. Vegetable LaboratoryCharlestonUSA
  7. 7.Long Island Horticultural Research and Extension CenterCornell UniversityRiverheadUSA

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