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Characterization of detoxification enzymes activity induced in Brevipalpus yothersi (Acari: Tenuipalpidae) exposed to a combinations of acaricides and insecticides

Grant number: 19/08384-9
Support Opportunities:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): August 01, 2019
Effective date (End): January 31, 2020
Field of knowledge:Agronomical Sciences - Agronomy - Plant Health
Principal Investigator:Daniel Júnior de Andrade
Grantee:Jaqueline Franciosi Della Vechia
Supervisor: Thomas Van Leeuwen
Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil
Research place: Ghent University (UGent), Belgium  
Associated to the scholarship: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), BP.DR


Brevipalpus yothersi Baker (1949) (Acari: Tenuipalpidae) is one of the most mite species known to cause indirect damages in citrus. The importance of this mite is related to the ability to transmit the virus Citrus leprosis virus, which causes the disease known as citrus leprosis. Since 2004, after the reported Huanglongbing (HLB) disease in Brazil, the frequency of insecticides spraying and the incidence of pest mites increased considerably. The population increase of phytophagous mites can be associated to low susceptibility of mites to insecticides, increased dispersion and/or repellency, changes in feeding behavior and oviposition, hormesis effect and reduction in the efficiency of acaricides due to tank mixtures. The reduction of the efficiency of the pesticides in a mixture may occur due to the incompatibility or antagonism between the products due to changes in the physicochemical characteristics of the products or due to biological changes in the target organisms after exposure to the mixture. In previous studies, it was verified that the efficiency of the spirodiclofen acaricide on the B. yothersi mite is reduced when insecticides are added to the spray solution. However, this antagonism was not a result of changes in the physicochemical characteristics. The other possible reason for antagonism between pesticides in the mixture, which has not yet been studied, is the change in the activity of detoxifying enzymes. Thus, the aims of this research project are to characterize the activity of detoxification enzymes induced in B. yothersi mites exposed to isolated and mixed products, quantify the duration of changes in the activities of evaluated enzymes and determine detoxification genes involved in these organisms. We will determine enzymatic activity in mites previously exposed to insecticides and after application of acaricide. The expression of detoxifying genes will be compared among specimens of B. yothersi exposed to insecticides, acaricide, and insecticide in mixture and mites that will not be exposed to pesticides.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ROCHA, CLAUDIANE M.; DELLA VECHIA, JAQUELINE F.; SAVI, PATRICE J.; OMOTO, CELSO; ANDRADE, DANIEL J.. Resistance to spirodiclofen in Brevipalpus yothersi (Acari: Tenuipalpidae) from Brazilian citrus groves: detection, monitoring, and population performance. Pest Management Science, v. 77, n. 7, p. 3099-3106, . (18/06174-4, 19/08384-9)

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