The tomato leaf miner, Tuta absoluta (Meyric), second instar larvae were exposed for 1 day to LC 50 of Bacillus thuringiensis (Berliner) subsp. kurstaki or Beauveria bassiana (Balsamo) on treated tomato foliages. Treated larvae had the longest development period while non-treated larvae had the shortest development period. The highest survivorship (l x ) of adults was obtained by the non-treated larvae while the lowest survivorship was obtained by B. thuringiensis-treated larvae. The lowest age-specific fecundity (m x ) of females was obtained by individuals treated as second instar larvae with B. bassiana. The intrinsic rate of increase (r m ) reached its maximum with non-treated individuals while this value decreased to the minimum values with biopesticide-treated individuals. Therefore, development, survival, and reproduction of treated individuals were lower than those of non-treated individuals. The reproduction period and adult longevity were the shortest considering biopesticide-treated individuals. The highest and lowest net reproductive rates (R 0 ) were recorded for nontreated and treated individuals, respectively. The mean generation time was increased with biopesticide-treated individuals.

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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 .

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Thrips attacks different types of plants including buds, leaves and flowers where, heavy pest infestation can degrade the quality of the agricultural products that can reach the half. The study aimed to improve the understanding of prey-predator interaction between Orius albidipennis nymphs and Thrips tabaci nymphs and the degree of the response of the predator change when they feed on different prey densities. The predator O. albidipennis nymphs were collected from the colony reared in the biological control Res. Dep. ARC. Giza, Egypt, and starved for 4 h in glass vials containing small wet cotton with water without preys. Thrips tabaci nymph were introduced as prey into small Petri dishes at three densities (10, 20 and 30 nymphs), respectively. Starved predators were transferred to the experimental arena using smooth hair brush. The number of dead or live nymphs was counted. 25 replicates of each prey density were performed. The results showed that at densities of 10, 20, and 30 nymphs per arena, the consumed prey significantly increased with increasing prey density. When only 10 thrips nymphs were provided, O. albidipennis consumed a mean of 6.8±1.2 thrips nymphs per predator per day, even when 20 thrips nymphs were provided the consummation increased to 15.1±1.7 and increased to 26.5±2.9 when 30 thrips nymphs were provided, as a result, the obtained data indicates that the predators can efficiently find the thrips nymphs at low densities. However, the handling time (Th) of O. albidipennis which is sometimes consider as a good indicator of the predation rate that was the shortest at third nymphal instar than first nymphal instar when fed on nymphs of T. tabaci, respectively. The results demonstrated the calculation of the attack rate (à) and handling time (Th) significantly declined as stages reseed.