Resistance to spirodiclofen in Brevipalpus yothersi (Acari: Tenuipalpidae) from Brazilian citrus groves: detection, monitoring, and population performance

Author(s)

Rocha, Claudiane M. ^[1] ; Della Vechia, Jaqueline F. ^[1] ; Savi, Patrice J. ^[1] ; Omoto, Celso ^[2] ; Andrade, Daniel J. ^[1]

Affiliation

^[1] Sao Paulo State Univ, Dept Agr Sci, Coll Agr & Vet Sci, UNESP, Via Acesso Prof Paulo Donato Castellane S-N, BR-14884900 Jaboticabal, SP - Brazil

^[2] Univ Sao Paulo, Dept Entomol & Acarol, USP, ESALQ, Sao Paulo - Brazil

• Document type: Journal article
• Source: Pest Management Science; v. 77, n. 7, p. 3099-3106, JUL 2021.
• Web of Science Citations: 0

Abstract

BACKGROUND Brevipalpus yothersi mite is the main vector of Citrus leprosis virus (CiLV), the causal agent of citrus leprosis disease. The acaricide spirodiclofen has been widely used to control this mite. However, failures in control using spirodiclofen have been frequently reported by citrus growers. In this study, we estimated the diagnostic concentration to monitor the resistance to spirodiclofen of B. yothersi populations collected in nine citrus groves in Brazil. We then selected the B. yothersi population that showed lowest mortality with the estimated diagnostic concentration of spirodiclofen to characterize the frequency of resistant individuals, as well as demographic and life table parameters. RESULTS Variability was higher between populations in terms of susceptibility to spirodiclofen. The frequency of resistant eggs between populations ranged from 0.7% to 85.8%. The resistance ratio of B. yothersi to spirodiclofen was low to moderate. Survival rates of the immature stage, total adult longevity, oviposition days, and female fecundity were lower in the resistant strain. Furthermore, net reproduction rate, intrinsic rate of increase, finite rate of increase, and mean length of a generation were also lower in the R strain. CONCLUSION Although variations in resistance to spirodiclofen were observed between populations, the resistance ratio was low to moderate. Such data can be useful in the development of resistance management strategies for B. yothersi in Brazilian citrus groves. (AU)

• FAPESP's process: 18/06174-4 - Determination of enzymatic activity and biological and behavioral changes induced by the combination of acaricides with insecticides in Brevipalpus yothersi (Acari: Tenuipalpidae)
• Grantee: Jaqueline Franciosi Della Vechia
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 19/08384-9 - Characterization of detoxification enzymes activity induced in Brevipalpus yothersi (Acari: Tenuipalpidae) exposed to a combinations of acaricides and insecticides
• Grantee: Jaqueline Franciosi Della Vechia
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate