The stomach poisonous impact of some insect growth regulators and biocides was tested under laboratory and semi-field conditions against cotton leafworm, S. littoralis. Obtained results revealed that, the second instar larvae reflected higher level of susceptibility towards all the tested insecticides than fourth one. According to LC 50 and LC 90 values, chlorpyrifos was the most effective insecticide that recorded 0.1 and 0.809 ppm for 2 nd instar larvae and 0.472 and 6.838 ppm for 4 th instar larvae, respectively. Meanwhile, tebufenozide appeared to be the least effective compound against both tested instars that gave 9.901and 36.447 ppm against 2 nd instar, whereas the LC 50 and LC 90 values were 65.736 and 1000.775 ppm) against the 4 th one, respectively. The rest compounds gave moderate effects in this respect.Data concerning the initial and residual activity of the tested insecticides, Tracer, XDE, methoxyfenozide, Dipel 2x and chlorpyrifos against 4 th instar larvae of field strain cotton leafworm, S. littoralis were determined. The initial effect calculated as the cumulative mortalities at zero time recorded 100, 100, 92, 88 and 26 % for methoxyfenozide, chlorpyrifos, XDE, Tracer and Dipel 2x, respectively. The untreated check recorded 2%, methoxyfenozide and chlorpyrifos gave the highest significant mortalities effects comparing to the untreated, Chlorpyrifos and methoxyfenozide were detected the highest significant mortalities effect as general residual effect whereas Dipel 2x recorded the least significant mortality effect, which it being 18.40% as compared to other insecticides.

he present work was conducted during 2012 and 2013 seasons to survey the Hemipterous insects, aphids, leafhoppers and whiteflies infesting cowpea crop at Abo-Hammad district, El-Sharkia governorate, Egypt. The seasonal abundance of the aforementioned dominant species and the effects of maximum & minimum temperatures and relative humidity on the pest population were also studied. Plant samples collecting proved to be the most efficient method for collecting aphids and whiteflies, while the sweeping net is more efficient for collecting leafhoppers. A. craccivora, A. gossypii, E. decipiens, E. decedens, C. chinai and B. tabaci were surveyed. A. craccivora recorded one peak at the 4 th week of July in the two study seasons. A. gossypii recorded one peak at the 2 nd week of August in 2012 season. In the second season, 2013, two peaks were recorded in the 4 th week of July and the 2 nd week of August, respectively. E. decipiens recorded two peaks, the first one was recorded at the 3 rd and 4 th week of July for 2012 and 2013 seasons, respectively, while the second one occurred at the 3 rd week of August for the two seasons, respectively. E. decedens recorded two peaks at the 4 th week of July and August for the two seasons, respectively. Two peaks for immature B. tabaci were recorded. The first peak was obtained at the end of July for the two seasons of the study. The second one was noticed at the 3 rd week of August for the two seasons. Adults of B. tabaci recorded the first peak at the 3 rd week of July for 2012 and 2013 seasons. Their second peak occurred in the 2 nd week of August for the two seasons. The results clearly indicated the presence of significant and insignificant correlation coefficient and partial regression between numbers of different insect species and maximum & minimum temperature and relative humidity during the two successive seasons.

opulation fluctuations of certain mites associated with soybean and cotton plants were investigated during seasons, 2012 and 2013 at Sharkia Governorate, as well as its relation with some prevailing climatic factors. In soybean plants, the population of phytophagous mite, Tetranychus urticae Koch was recorded in high number in 2 nd season than the 1 st one, whereby represented by 272.83 and 202.69 individuals, respectively. While, the predacious mite, Phytoseiulus macropilis (Banks) recorded in high number in 1 st season than the 2 nd season were aggregated 37.72 and 25.91 individuals, respectively; on soybean plants. The population of T. urticae was higher in 1 st year than the 2 nd year (394.92 and 367.65 individuals, respectively; while the predacious mites were high in the 2 nd year than that obtained in the 1 st one on cotton plants. These results revealed that there is negative significant relation between the predacious mite species and the phytophagous mite species on soybean and cotton plants. The population of the spider mite T. urticae was significantly related to the leaf contents of protein and phosphorous, while there was no significance between the predator (P. macropilis) with leaf phytochemical contents of soybean during two seasons 2012/13. The population of the spider mite and leaf phytochemical contents of cotton during season 2013 revealed that there is highly significant correlation between the pest mite T. urticae with protein, carbohydrate, total sugar and reducing sugar, while there was no significance between the pest and non-reducing sugar. The population revealed that there is no significant correlation between the predator Typhlodromus californicus with protein, carbohydrate, reducing sugar and non-reducing sugar. The correlation coefficient was significant between the predator Agistemus exsertus and carbohydrate, total sugar and reducing sugar, they also recorded a highly significant correlation between the predator and protein; while there was no significance difference between the two predators (A. swiriskii & E. scutalis) with phytochemical contents.

he influence of three host plants (peanut, cotton and maize) on the developmental stages and fecundity of Tetranychus cucurbitacearum (Sayed) was significant effect on some biological aspects of T. cucurbitacearum (Sayed). Peanut was the most favorite one for T. cucurbitacearum, giving high fecundity (120.61 egg / female) while maize was the least favorite; while the total deposited eggs was 61.84 eggs.

The present work was conducted to evaluate the comparative efficiency of certain phenol compounds (Salicylic acid, Benzoic acid, Acetylsalicylic acid and Sodium benzoate) on certain biological aspects of the Mediterranean fruit fly (MFF), Ceratitis capitata and the peach fruit fly (PFF) Bactrocera zonata under laboratory conditions. Salicylic acid and acetylsalicylic acid showed the same record on larval duration of MFF (10.5 days) and lowest record of % pupation of 70.5 and 75.8%, respectively. Also, control recorded the lowest pupal duration 8.1 days and highest average of fecundity (27.9 eggs/female), daily rate of oviposition (11.5 eggs/female/day), the total of deposited eggs of 1628.3, % hatchability 96.7% and longevity of males 27.5 days, whereas sodium benzoate showed the highest average of oviposition period (31.1 days) and high female longevity 35.7 days for MFF. Larval duration of PFF significantly showed the shortest period of 7.6 days and highest % pupation 100% with larval diet treated with sodium benzoate. Control showed the shortest pupal duration 7.8 days and highest average of fecundity (22.8 eggs/female), daily rate of oviposition (8.6 eggs/female/day), the total of deposited eggs of 1454.7, % hatchability of 92.3% and longevity of males (45.1 days). But, sodium benzoate showed the highest period of oviposition 38.8 days and females longevity 54.5 days.