In order to
evaluate the larvicidal and biochemical effects of some aromatic plant oils
against the cotton leafworm larvae, Spodoptera littoralis (Boisduval),
the present investigation was carried out. Four commercial aromatic oils;
garlic, mint, eucalyptus, and lavender oils, were tested against 2^nd
and 4^th instar larvae. Results showed that all tested oils were so
efficient, especially; the garlic oil as it exhibited the least LC₅₀
value for both 2^nd and 4^th instar larvae. Results also
revealed significant disruption (either reduced or enhanced) enzyme activity.
In conclusion, tested oils proved to have insecticidal, antifeedant, and
inhibitory enzymatic activity effects. So that, tested oils can be applied
safely in IPM program for the cotton leafworm, Spodoptera littoralis
control.