Control of Tetranychus urticae Koch by extracts of three essential oils of chamomile, marjoram and Eucalyptus.
- Author:
M R Afify Abd EL-MONEIM
1
;
S Ali FATMA
;
A F TURKY
Author Information
- Publication Type:Journal Article
- Keywords: Alkaline phosphatase; Chamomile; Enzymes; Eucalyptus; Glutathione-S-transferase; Marjoram; Non specific esterase; Plant essential oils; Protease; Tetranychidae
- MeSH: Acaricides; isolation & purification; pharmacology; Animals; Chamomile; chemistry; Drug Resistance; Enzymes; analysis; Eucalyptus; chemistry; Female; Male; Oils, Volatile; isolation & purification; pharmacology; Origanum; chemistry; Survival Analysis; Tetranychidae; drug effects; enzymology
- From:Asian Pacific Journal of Tropical Biomedicine 2012;2(1):24-30
- CountryChina
- Language:English
-
Abstract:
OBJECTIVETo evaluate the acaricidal activity of extracts of three essential oils of chamomile, marjoram and Eucalyptus against Tetranychus urticae (T. urticae) Koch.
METHODSExtracts of three essential oils of chamomile, marjoram and Eucalyptus with different concentrations (0.5%, 1.0%, 2.0%, 3.0% and 4.0%) were used to control T. urticae Koch.
RESULTSThe results showed that chamomile (Chamomilla recutita) represented the most potent efficient acaricidal agent against Tetranychus followed by marjoram (Marjorana hortensis) and Eucalyptus. The LC50 values of chamomile, marjoram and Eucalyptus for adults were 0.65, 1.84 and 2.18, respectively and for eggs 1.17, 6.26 and 7.33, respectively. Activities of enzymes including glutathione-S-transferase, esterase (α-esterase and β-esterase) and alkaline phosphatase in susceptible mites were determined and activities of enzymes involved in the resistance of acaricides were proved. Protease enzyme was significantly decreased at LC50 of both chamomile and marjoram compared with positive control. Gas chromatography-mass spectrometer (GC-MS) proved that the major compositions of Chamomilla recutita are α-bisabolol oxide A (35.251%), and trans-β-farersene (7.758%), while the main components of Marjorana hortensis are terpinene-4-ol (23.860%), p-cymene (23.404%) and sabinene (10.904%).
CONCLUSIONSIt can be concluded that extracts of three essential oils of chamomile, marjoram and Eucalyptus possess acaricidal activity against T. urticae.
