The present work aimed to study the toxic and antifeeding activities of certain plant extracts against Spodoptera littoralis (Boisd.) The extracts of lantana and lemongrass leaves were applied at 5 & 10% concentrations, against 2 nd and 4 th instars larvae of S. littoralis under laboratory conditions 27 ± 2 °C and 55 -65% relative humidity. Results showed that the lemongrass extract in water at 10% conc. on the 2 nd larval instar and lantana extract in water at 10% conc. on 4 th larval instar were the highest in efficacy as antifeedants. Regarding, conversion of ingested and digested food (ECI) & (ECD) lantana extract in water 10% had the least effect. The highest mortality percentage was attained from the lemongrass extract in acetone 10% and lantana extract in water 5% treatments against both the 2 nd and 4 th larval instars, respectively. Data showed that all the plant extracts caused significant reductions in respect of larval and pupal durations, pupal weight and % of adult emergence compared with the untreated check. The plant extracts had a clear effect on the carbohydrates hydrolysis enzymes as amylase and trehalse.

field experiment was conducted to evaluate the efficiency of some non-conventional pesticides against the leaf miner, Liriomyza trifolii (Burgess) and its parasitoids on faba bean plants from November 2013 to March 2014. There were seven treatments viz, Beauvaria bassiana (biopower), diathane-M45, mineral oils (KZ and Kappi), (ethanol and ethyl acetate extracts of casuarina leaves) and untreated control.. The results showed that, amongest the pesticides tested, Biopower 1.15%wp significantly reduced larvae population of leafminer by 83.54 and 79.48% mean percent mortality after the first spray and the second spray, respectively. Followed by ethanol extract of casuarina (63.51 and 60.49%). The rest of the treatments viz diathane M-45 (64.62 and 18.30), KZ oil (26.9 and 7.48%), also effective in minimizing the pest population after the first and the second spray application, respectively. Parasitoid species reared from larvae of L.trifoli werei, Diglyphus isaea (Walk.), D.crassinveris (Erdos.), Chrysocharis sp., Neochrysocharis sp. and Hemiptarsenus sp. (Hymenoptera: Eulophidae). Significantly higher seed yields were recorded from biopower, Diathane and ethanol casuarina leaves extract plots as compared to yields from KZ oil, ethyl acetate extract, kappi oil and untreated control .

The effect of different concentrations for both of water flaebane leaves and mango seed plant extracts were studied especially their biological and biochemical effects on the 4 th larval instar of Agrotis ipsilon using toxic baits. The results clearly demonstrated that the tested extracts achieved significant increase in the pupal longevity and significant reduction in the larval longevity and pupal weight besides the percentage of pupation. Also, on the adult longevity for either male or female. There was remarkable significant increase in the percentage of malformation for both pupae and adults. The best treatment among all the tested extracts was water mango seed extract at 5% concentration followed by water flae-bane leaves at the same concentration. The biochemical studies proved that water mango seed extract caused increase in the secretion of both of glucsidase and Trehalse enzymes, and decrease in the secretion of acetyl choline esterase. While, water flae-bane leaves extract caused increase in the secretion of acetyl choline esterase. From this point of view, may be the extracts had an effect on the rate of glucose absorption in the blood.