Inoculum reduction and vector control on the temporal progress of citrus variegated chlorosis incidence

Author(s)

Bassanezi, Renato B. ^[1] ; Primiano, V, Isabela ; Moreira, Alecio S. ^[2]

Affiliation

^[1] V, Fund Citrus Protect Fundecitrus, Res & Dev Dept, BR-14807040 Araraquara, SP - Brazil

^[2] Embrapa Cassava & Fruits, Cruz Das Almas - Brazil

• Document type: Journal article
• Source: Pest Management Science; v. 77, n. 7, p. 3333-3340, JUL 2021.
• Web of Science Citations: 0

Abstract

BACKGROUND Citrus variegated chlorosis (CVC) is an important citrus disease caused by the sharpshooter-transmitted bacterium Xylella fastidiosa subsp. pauca. Information about the efficacy of its disease management is bounded to either inoculum reduction or vector control. This study aimed to assess the role of different frequencies of roguing of symptomatic trees combined with different chemical control programs for the sharpshooters on CVC temporal progress. The experimental area was set up in October 2005 and had a 3 x 3 factorial design. Symptomatic tree removal intervals were every 28, 56, and 112 days to May 2012. Vector control treatments were no control, program A (PA), and program B (PB). Contact insecticides were sprayed every 28 (PA) or 14 (PB) days. Trees within both programs were treated with systemic and foliar insecticides to October 2008. After this, systemic insecticides were discontinued and only foliar treatments were applied. The number of diseased trees and the sharpshooter population were assessed to April 2015. RESULTS Detection of the first symptomatic trees was similar for all treatments and occurred, on average, in month 50 after planting. Sharpshooter population and cumulative disease incidence were similar for all roguing intervals and between vector control programs, differing in plots with no control. We observed a reduction over 85% in disease incidence for both PA and PB compared with no control. CONCLUSION These results support systematic control of sharpshooters as an efficient strategy for reducing CVC progress. (AU)

• FAPESP's process: 05/00718-2 - Studies on the bacterium Candidatus Liberibacter spp., causal agent of citrus huanglongbing (ex-greening): diagnosis, biology and management
• Grantee: Marcos Antonio Machado
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 07/55013-9 - Molecular epidemiology and integrated management of Huanglongbing (asiaticus and americanus) in the State of São Paulo
• Grantee: Armando Bergamin Filho
• Support Opportunities: Research Projects - Thematic Grants