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Insecticidal, antifeedant and oviposition deterrent effects of the essential oil and individual compounds from leaves of Chloroxylon swietenia DC.
Author(s) -
Kiran S Ravi,
Reddy A Shiva,
Devi P Sita,
Reddy K Janardhan
Publication year - 2006
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.1266
Subject(s) - cutworm , essential oil , limonene , spodoptera litura , bioassay , swietenia macrophylla , gas chromatography , biology , toxicology , biopesticide , food science , botany , chemistry , larva , chromatography , noctuidae , pesticide , agronomy , genetics
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‐β‐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 LD 50 values of 28.6, 35.4 and 40.7 µg per larva respectively. Maximum feeding deterrence was noted for geijerene and pregeijerene, with DC 50 values of 82.5 and 95.1 µg 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. Copyright © 2006 Society of Chemical Industry