Repellent and Insecticidal Effects of the Essential Oil of <I>Kaempferia galanga</I> Rhizomes to <I>Liposcelis bostrychophila</I> (Psocoptera: Liposcelidae)

Abstract

The aim of this research was to determine chemical composition and repellent and insecticidal activities of the essential oil of Kaempferia galanga L. rhizomes against the booklouse, Liposcelis bostrychophila Badonnel, and to isolate insecticidal or repellent constituents from the oil. The essential oil was obtained by hydrodistillation and analyzed by gas chromatography-mass spectrometry. Twenty-eight components of the oil were identified. The major compounds in the oil were ethyl-rho-methoxycinnamate (38.6%), ethyl cinnamate (23.2%), 1,8-cineole (11.5%), trans-cinnamaldehyde (5.3%), and borneol (5.2%). Based on bioactivity-guided fractionation, four active constituents were isolated from the oil and identified as 1,8-cineole, ethyl cinnamate, ethyl rho-methoxycinnamate, and trans-cinnamaldehyde. The essential oil exhibited contact toxicity against the booklouse with an LC50 value of 68.6 microg/cm2. Ethyl cinnamate (LC50 = 21.4 microg/cm2) exhibited stronger contact toxicity than ethyl rho-methoxycinnamate and trans-cinnamaldehyde (LC50 = 44.6 and 43.4 microg/cm2, respectively) while 1,8-cineole showed weak acute toxicity. The essential oil also possessed fumigant toxicity against the booklouse with a LC50 value of 1.5 mg/liter air. 1,8-Cineole and trans-cinnamaldehyde (LC50 = 1.1 and 1.3 mg/liter, respectively) possessed stronger fumigant toxicity against the booklouse than ethyl cinnamate and ethyl rho-methoxycinnamate (LC50 = 10.2 and 10.2 mg/liter air, respectively). trans-Cinnamaldehyde was strongly repellent to booklice, whereas ethyl cinnamate and ethyl rho-methoxycinnamate were weakly repellent and 1,8-cineole did not repel booklice. The results indicate that the essential oil and its constituent compounds have potential for development into natural insecticides or fumigants and repellents for control of insects in stored grains.

Chemical composition and insecticidal properties of the essential oil of <i>Bidens frondosa</i> L (Asteraceae) against booklice (<i>Liposcelis bostrychophila</i>)

“…However, the essential oil of B. frondosa demonstrated stronger contact toxicity against L. bostrychophila adults than several essential oils using the same bioassay, e.g. Artemisia rupestris [11], A. frigida [12], Curcuma wenyujin [13], Foeniculum vulgare [14], and Valeriana jatamansi [15], however, the essential oil of B. frondosa shows less contact toxicity than the essential oils of Illicium henryi [16] and Kaempferia galangal [17]. Among the four isolated constituents, caryophyllene oxide, and borneol displayed stronger contact toxicity (no overlap in 95 % fiducial limit) than the essential oil against the booklice (L. bostrychophila).…”

“…When compared with dichlorvos (LC 50 = 1.35 μg/L), the essential oil of B. frondosa and 4-terpineol showed only 375 times and 248 times less toxicity against L. bostrychophila, respectively. However, the essential oil of B. frondosa demonstrated a stronger fumigant toxicity against booklice than several essential oils using the same bioassay, e.g., Artemisia rupestris (LC 50 = 6.67 mg/L air) [11], A. frigida (LC 50 =1.25 mg/L) [12], C. wenyujin (LC 50 = 2.76 mg/L) [13], V. jatamansi (LC 50 = 6.0 mg/L) [15], and K. galangal (LC 50 = 1.5 mg/L air) [17], but the oil of B. frondosa demonstrated less toxicity than the essential oils of Allium chinense (LC 50 = 186.5 g/L air) [18] and F. vulgare fruits (LC 50 = 34.07 μg/L) [14]. However, the currently commercial fumigants (e.g.…”

Isolation of nematicidal constituents from essential oil of <i>Kaempferia galanga</i> L rhizome and their activity against <i>Heterodera avenae</i> Wollenweber

“…It also has a long history of fragrance use to help restlessness, stress, anxiety and depression [13]. This herb has broad-spectrum biological activities including larvicidal [14], amebicidal [15], nematicidal [16][17][18], antimicrobial [19] and repellent effects [20]. However, to the best of our knowledge, there have been no reports to date which describe nematicidal activity of the essential oil of K. galanga rhizomes against the cereal cyst nematodes.…”

Use of plant-derived products to control household and structural arthropod pests

“…Action was enhanced significantly when EO were combined with 12% CO2 + 9% O2 or balanced N2 [68]. Between 28 compounds of essential oil extracted from Kaempferia galanga., only transcinnamaldehyde exerted contact, fumigant and repellent actions [69]. Extraction of essential oils is costly, crude oils may therefore be tested at least for repellency.…”