Laboratory experiments were conducted to study the potential impact of genetically modified corn hybrid, transgenic Bacillus thuringiensis (Bt)-expressing (Cry2Ab/1Ac), and the corresponding isogenic untransformed Bt-free hybrid on biological parameters of the green lacewing predator, Chrysoperla carnea (Stephens). The effectiveness of transgenic (Bt)-expressing (Cry2Ab/1Ac) on C. carnea developmental parameters (larval duration, pupal duration, mortality %, pupation %, adult emergence %, and adult duration time) was investigated in the first experiment. In the second experiment, the effect of Bt Cry2Ab and Cry1Ac partially purified toxins on the hatchability of C. carnea eggs compared to cypermethrin was examined. Additionally, the toxicity effect of Angoumois grain moth, Sitotroga cerealella, eggs sprayed with BtCry2Ab/1Ac mixture and cypermethrin on C. carnea was tested. The results showed that the mortality percentage of C. carnea fed on aphids reared on Bt corn (40%) was less than that fed on aphids reared on non-Bt corn (50%). Moreover, the larval mortality %, net pupation, and adults' emergence percentage of C. carnea larvae fed on aphids reared on Bt corn and non-Bt corn were not significantly different. On the other hand, the hatchability data showed that the chemical insecticide (cypermethrin) severely affected the C. carnea eggs compared to Cry2Ab/1Ac toxins. These findings proved that adopting biopesticide formulation based on Bt toxins or Bt-modified crops will not only affect C. carnea but also enhance its ability as a potential biological pest control agent.

This study aimed to study the susceptibility of some tomato plant varieties to some pests and predators population during two successive seasons Nili 2011 and 2012. The obtained results revealed significant differences between the populations mean of Bemisia. Tabaci (Genn.) immature stages on Meram and the two other cultivars, while there were no significant differences in population between Rawan and supper-gekal varieties. Also a significant difference between the populations' mean of Myzus persicae (Sulzer) on Tomato variety supper-gekal and the two others. The means number of Coccinella undecimpunctata and Scymnus syriacus were significant between Tomato cultivar supper-gekal and Rawan, while there were no significant differences in population between Rawan, and Meram varieties. In addition, the results reveled that, there are insignificant between the populations of Orius albidipennis on the three tested varieties. The differences between the population mean of Euseius scutalis Athias-Henriot appeared no significant on the three tested tomato varieties. The data indicated significant differences between the population of Tetranychus urticae Koch and Tetranychus cucurbitacearum (Sayed).on Meram and the two other varieties.

www.eajbs.eg.net Comparison between the infestation rate of certain pests on cucumber and kidney bean and its relation with abiotic factors and anatomical characters.

The experiment was conducted in the fall growing season of 2013 at farmer field in Badrashin province, Giza Governorate. The present study is to investigate and determines the suitable area (size), heights and direction positions of the yellow sticky traps to utilize those factors as new tools while implement the Integrated Pest Management strategy. Statistical analysis was showed presence highly significant differences between the tested trap sizes .The Data indicated that , the tested trap sizes can be arranged descending as follow: 200 >160 >80 >40> 20 Cm² in both tomato and cabbage fields. Moreover, the traps with 10 x 20 cm was captured the highest number of the Bemisia tabaci, adult, 38.33 and 566.27 (adults/trap) in tomato and cabbage crop, respectively. Data indicated that, there was an irreversible relationship between the number of the adults caught by the trap and its height. Where, the trap with 20 cm height above the ground surface recorded the highest captured whitefly adult per trap (63.33, 18.33 and 23.76 adult/trap in tomato, cabbage and uncultivated part (control), respectively). The results cleared that, the free hanging position type caught the highest number (164.87 adult/trap), but the reversible type caught the lowest number (19.07 adult/trap).The tested trap position arranged descending according its captures values as follow: free hanging> horizontal position> 45° angel towards north> vertical towards north > reversible trap, where its capture values were 164.87, 125.56, 109.30, 60.80 and 19.06 adult/trap. The trap with size 10X20 Cm², 20 Cm above the ground surface and free hanging recorded the highest capture of B. tabaci. The previous specification can be used to provide a clear picture about the population density of the whitefly in different crops at different period and use as implement tolls in the integrated pest management program.

A field experiment was conducted during autumn plantation in season 2017 at Qaha, Qalubiya Governorate to evaluate the efficiency of ten different control agents; four of them are biorational components (garlic extract, rosemary oil + sunflower oil, sesame oil and chili oil), three of them are natural pesticide (Techno Oil, Top9 and Berna Star), one agent of them is bio-pesticide (bio-fly) and two chemical pesticide (Blanch 48% SC, Mospilan 20% SP) in reducing the population densities of Bemisia tabaci and Tetranychus urticae on Hatma potato cultivar. The results indicated that there were significant differences between the ten tested compounds in reducing the population density of B. tabaci nymphs; Mospilan 20% SP was the most potent compounds in reducing the population density of B. tabaci nymphs causing the highest reduction percentage (83.58 %), while Top9 gave a low effect with reduction percentage (49.32%) and Bio-fly gave moderate reduction percentage (63.92%). These compounds could be divided into two groups according to the reduction percentage: 1 st group contains Mospilan 20% SP, Blanch 48% SC (chemical pesticides), Berna Star and Techno Oil (natural pesticides), respectively. 2 nd group contains on Biofly (bio-pesticide), sesame oil, garlic extract, chili oil, rosemary oil + sunflower oil (biorational components), and Top9 (natural pesticide) on B. tabaci nymphs. Results also revealed that there were significant differences between the mean of general reduction percentage of the ten tested compounds on T. urticae population. Mospilan 20% SP recorded the highest reduction percentage (73.1 %), (rosemary oil + sunflower oil) treatment recorded the lowest reduction percentage 41.97% and Top9 gave moderate reduction percentage (60.03%). These compounds could be divided into two groups: 1 st group contains on Mospilan 20% SP, Techno Oil, Blanch 48% SC, garlic extract, Top9, chili oil, sesame oil and Berna Star respectively. 2 nd group contains on Bio-fly and (rosemary oil + sunflower oil) respectively.