Insecticidal, antifeedant and oviposition deterrent effects of the essential oil and individual compounds from leaves of Chloroxylon swietenia DC.

Abstract

Essential oil from the leaves of Chloroxylon swietenia DC. was obtained by hydrodistillation and cold extraction, and the chemical composition was determined by gas chromatography and gas chromatography-mass spectrometry. The major identified components were limonene, geijerene, pregeijerene, germacrene D and trans-beta-ocimene. Laboratory bioassays of the essential oil and four constituents of essential oil isolates were evaluated for insecticidal, antifeedant and oviposition deterrent effects on tobacco cutworm, Spodoptera litura (F.). Toxicity was determined by topical application of the isolates at varying concentrations. Pure oil, geijerene and pregeijerene were found to be more toxic, with LD50 values of 28.6, 35.4 and 40.7 microg per larva respectively. Maximum feeding deterrence was noted for geijerene and pregeijerene, with DC(50) values of 82.5 and 95.1 microg cm(-2) respectively. Furthermore, pure oil, geijerene and pregeijerene displayed oviposition deterrence, even at low concentrations. These results indicate that these natural products may lead to useful, biodegradable, environmentally safe insect control agents.

Characterization of volatile constituents of Scaligeria tripartita and studies on the antifungal activity against phytopathogenic fungi

“…lithophila oil [18] and we were the first to show the occurrence of traginone and dictamnol in Pimpinella. Kiran et al recently reported that geijerene and pregeijerene displayed oviposition deterrence effects on the tobacco cutworm, Spodoptera litura, at low concentration [36]. The quantity of geijerene and pregeijerene present make S. tripartita a good source of these compounds as potential natural pesticides.…”

Subterranean Herbivore-induced Volatiles Released by Citrus Roots upon Feeding by Diaprepes abbreviatus Recruit Entomopathogenic Nematodes

“…Our results also suggest that 'geijerenes' mediate this response. These C 12 terpenes have not been described for citrus previously; however, they are known for insecticidal, antifeedant, and oviposition deterrent effects in leaves of other rutaceous plant species (Kiran et al 2006;Kiran and Devi 2007). Geijerenes also have been described in hairy root cultures of Pimpinella anisum (Santos et al 1998).…”

Repellent activity of citrus oils against the cockroaches Blattella germanica, Periplaneta americana and P. fuliginosa

“…This difference could of course be due to other different physiological/biochemical characteristics. 11) Essential oils have been utilized as insecticides, antifeedants, and repellents with a wide variety of target insects [12][13][14][15][16][17][18][19][23][24][25][26][27] ; however, one study that tested 96 herb extracts found that while Japanese mint oil had a strong repellent effect against B. germanica, the essential oils of grapefruit, lemon, and lime did not show strong repellent activity. 28) This is in contrast with our results, but the previous study was performed by a classical assay method based on the behavior of cockroach groups, and this may have been affected by the chemical factors associated with aggregation.…”