To investigate the chemical composition and toxicity of the essential oil of Glycosmis parviflora
(Sims) Little aerial parts against root-knot nematode and two grain storage insects (maize
weevil and red flour beetle).
Steam distillation of G. parviflora
was carried out using Clavenger apparatus in order to
extract its volatile oil. Gas chromatography/mass spectrometric (GC/MS) analysis (HP-5MS column) of
the essential oil was performed and the toxicity of the oil determined by contact test.
A total of 37 components comprising 98.7 % of the essential oil were identified, of which (Z)-
caryophyllene (20.6 %), methyl isoeugenol (11.1 %), (Z)-β-ocimene (8.9 %), α-cubebene (6.4 %),
nerolidol (5.4 %), aromandendrene (4.9 %) and γ-pyronene (4.7 %) were found to be the major
components. The essential oil possessed strong nematicidal activity against M. incognita
with an LC50
value of 92.84 μg/ml. The essential oil of G. parviflora
exhibited strong contact toxicity against S.
and T. castaneum
adults with LD50
values of 41.7 and 22.6 μg/adult, respectively.
The study indicates that the essential oil of G. parviflora
aerial parts has a potential for
development into a natural insecticide/nematicide for control of nematodes and grain storage insects.