Acaricidal activity of the essential oil from Senecio cannabifolius and its constituents eucalyptol and camphor on engorged females and larvae of Rhipicephalus microplus (Acari: Ixodidae)

The objective of this experiment was to evaluate the acaricidal activity of Senecio cannabifolius essential oil, and two of its constituents, eucalyptol and camphor. Efficacy against females and larvae of Rhipicephalus ( Boophilus ) microplus was assessed by the adult immersion test (AIT) and the la...

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Bibliographic Details
Published in:Experimental & applied acarology 2021-03, Vol.83 (3), p.411-426
Main Authors: Yang, Peipei, Jia, Mengmeng, Zhu, Liang
Format: Article
Language:English
Subjects:
Acaricides
Animal Ecology
Animal Genetics and Genomics
Animal Systematics/Taxonomy/Biogeography
Animals
Biomedical and Life Sciences
Camphor
Constituents
Detoxification
Entomology
Enzymatic activity
Essential oils
Eucalyptol
Female
Females
Flame ionization
Gas chromatography
Immersion
Ionization
Ixodidae
Larva
Larvae
Life Sciences
Mass spectrometry
Mass spectroscopy
Oils & fats
Oils, Volatile
Plant Oils
Rhipicephalus
Senecio
Senecio cannabifolius
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Summary:The objective of this experiment was to evaluate the acaricidal activity of Senecio cannabifolius essential oil, and two of its constituents, eucalyptol and camphor. Efficacy against females and larvae of Rhipicephalus ( Boophilus ) microplus was assessed by the adult immersion test (AIT) and the larval immersion test (LIT). The oil was analyzed by gas chromatography-flame ionization detection (GC-FID) and GC-mass spectrometry (MS) and in total 68 components were identified representing 99.2% of the essential oil. AIT revealed that the oil, eucalyptol, and camphor at the highest concentration presented efficacy of 68.9, 57.1, and 71.9%, respectively. LIT revealed that the essential oil and camphor achieved 100% mortality at concentration of 1.6% wt/vol, whereas eucalyptol showed moderate inhibitory activity. Biochemical assays indicated that the essential oil and camphor can reduce significantly overall detoxification enzyme activities in engorged females and larvae at high concentration (≥ 0.4% wt/vol), whereas the inhibitory effect of eucalyptol is weaker than that of the oil and camphor. Taken together our results indicated that the S. cannabifolius essential oil and its isolated constituent had potential for the development of a new and safe acaricide for the control of R. microplus ticks.
ISSN:0168-8162
1572-9702
DOI:10.1007/s10493-021-00590-x