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Field experiments were conducted in the experimental farm of the Faculty of Agriculture, Mansoura University between January and December during the two successive years 2012-2013 and 2013-2014. Biweekly samplings were done on Lantana Camara L., to evaluate the population density of some insect pests attacking Lantana and their predators. The obtained results revealed that there were five species namely this species were Planococcus citri Risso, Ferrisia virgata (Cockerell), Orthezia insignis Browne, Aphis gossypii Glover and Bemisia tabaci (Gennadius) were recorded. The results showed that P. citri was the most dominant species in the two years of study. The predatory insects were Hyperaspis vinciguerra Capra, Scymnus syraicus Marseul and Chrysoperla carnea( Stephens). The population density of P. citri recorded three peaks in the two years of study, F. virgata had three peaks and O. insignis had three peaks in the two years of investigation.A. gossypii had three peaks during the two years, while the data cleared that B. tabaci, had three peaks during the two years of investigation. The dominant predator was H. vinciguerra the main predator of mealybug insects and this predator had four peaks during the two years of study. Scymnus syraicus and Chrysoperla carnea had one peaks during the two years of investigation.

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The experiments were carried out in guava orchard at Mansoura district, Dakahlia governorate, Egypt. Eight different plant oil extracts [olive, orange, peppermint, basil, clove (Egyptian & French), parsley and black cumin] were bioassayed as attractants for the tephritids, B. zonata and C. capitata males and females. B. zonata males and females as well as C. capitata females showed no response to all the tested oils. C. capitata males exhibited a significantly positive response to French and Egyptian clove oils; while it had no response to olive, basil, parsley and black cumin oils. The residual effectiveness of Egyptian and French clove oils were lost after nine days of exposure. Comparative study between prepared (local) and imported methyl eugenol was evaluated for 72 successive days. Statistical analysis indicated that there were significant differences between the local and imported methyl eugenol after 6, 12 and 18 days only. So, the local methyl eugenol traps may be used as a valuable tool in monitoring B. zonata. The attractiveness of B. zonata males to felt and plant fibers blocks (with different thickness) saturated with methyl eugenol was evaluated. The felt blocks captured the highest number of B. zonata males in comparison with those of plant fibers. The efficiency of plant fiber blocks was significantly affected by block thickness; while felt blocks did not affected by thickness.

Laboratory experiments were conducted in Economic Entomology Department, Faculty of Agriculture, Mansoura University to estimate the heat requirements for Aphis nerii Boyer de Fonscolombe. attacking oleander shrubs at Mansoura district and its predator Cydonia vicina isis Muls.The results assured that, the lower development threshold for the nymphal stage was 13.11 ºC , and the thermal units expressed as degree-days (dd's) required for nymphal stage were 98.53, 95.12 and 102.74 (dd's) at 20ºC, 25ºC and 28ºC, respectively and the adult stages needed about 129.92, 140.66 and 153.27 daydegrees to complete their development on the three tested degree temperatures, respectively.The results indicated that the lower development threshold of the adults s were 12 0 C, 14 0 C for male and female, respectively and the degree day's at 20 0 C, 25 0 C and 28 0 C, were 538.4, 721.6 and 609.6 for male and 467.4, 610.5, and 565.6 for female.