EFFECTIVENESS OF CERTAIN ESSENTIAL OILS ON SPODOPTERA LITTORALIS (BOISD)

The results revealed that the lowest concentrations (1%) of eucalyptus and clove oils caused 36.66 & 13.3 % mortality, respectively while the highest conc. 5% of the same oils caused 83.83 & 73.33% mortality, respectively against 4th instar larvae. Moreover, mortality was a concentration-dependent response. While LC50 values of eucalyptus and clove oils were 1.9859 and 3.378 %, respectively indicating that eucalyptus was more toxic than clove oil against 4th larval instar. The antifeeding percentage values were significant different between eucalyptus and clove oil-treatments either at low or high concentrations of both oils. Whereas, the maximum AF% was in the eucalyptus and clove oils (at 5% conc.) were 73.52 and 65.73%, respectively. Therefore, the tested EOs effectiveness was shown from acting either as biocides or antifeeding agents against S. littoralis larvae.