Citrus huanglongbing in Venezuela: partial distribution and relative incidence of Candidatus Liberibacter asiaticus (CLas)

  • Edgloris Marys Instituto Venezolano de Investigaciones Científicas (IVIC), Laboratorio de Biotecnología y Virología Vegetal, Centro de Microbiología y Biología Celular, Caracas. Venezuela. https://orcid.org/0000-0002-4463-9207
  • Rafael Mejías Universidad Central de Venezuela (UCV), Facultad de Agronomía (FAGRO), Laboratorio de Bacterias Fitopatógenas, Maracay. Venezuela.
  • Eduardo Rodríguez-Román Instituto Venezolano de Investigaciones Científicas (IVIC), Laboratorio de Biotecnología y Virología Vegetal, Centro de Microbiología y Biología Celular, Caracas. Venezuela.
  • Alexander Mejías Instituto Venezolano de Investigaciones Científicas (IVIC), Laboratorio de Biotecnología y Virología Vegetal, Centro de Microbiología y Biología Celular, Caracas. Venezuela.
  • Mailyn Mago Universidad Central de Venezuela (UCV), Facultad de Agronomía (FAGRO), Laboratorio de Manejo Integrado de Plagas Agrícolas y Urbanas, Maracay. Venezuela
Keywords: citrus greening, detection, distribution, HLB, PCR, Venezuela

Abstract

Huanglongbing (HLB), is the most devastating citrus disease in the world. Two of the three known HLB-associated (Candidatus Liberibacter spp.) species are present in the Americas. Among them, ‘Ca. L. asiaticus’ (CLas) was detected in Venezuela in 2017, although early characteristics HLB symptoms such as yellow shoots were first noticed in 2016. In this study, plant material from suspect citrus and from knowing HLB hosts, were collected in 17 municipalities in the states of Aragua, Carabobo, Yaracuy and Portuguesa (Venezuela) between August and November 2017, to determine CLas relative incidence and host range. Samples were then evaluated by PCR, using primers targeting the β-operon locus of ribosomal proteins. Out of 113 HLB-symptomatic citrus plants, 87 (76.9 %) were positive for CLas. Citrofortunella microcarpa, Swinglea glutinosa, and Murraya paniculata known host plants of the vector, the Asian citrus psyllid Diaphorina citri Kuwayama, were also found infected in all regions analyzed. Further spread of the pathogen is expected, given the nationwide distribution and abundance of the vector. Given the HLB-infection rates found in this study, additional surveys in eastern and western states are recommended to evaluate the spread and severity of the disease which will greatly assist the design of efficient management strategies based on research data.

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Published
2021-03-22
How to Cite
Marys, E., Mejías, R., Rodríguez-Román, E., Mejías, A., & Mago, M. (2021). Citrus huanglongbing in Venezuela: partial distribution and relative incidence of Candidatus Liberibacter asiaticus (CLas) . Agronomía Tropical, 71(1), 1-10. Retrieved from http://publicaciones.inia.gob.ve/index.php/agronomiatropical/article/view/642
Section
Original research article