الفهرس 
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Abstract
Dissertation Abstract : The two-spotted spider mite, Tetranychus urticae has a wide range of host plants including field crops, greenhouse crops, ornamentals and fruit trees. However, this mite species does not accept all plants to the same degree because of differences in nutritive, morphological and toxic constituents. The present work aimed to throw some light on the following topics: Incidence of different mites associated with different leguminous plants in Dakahlia and new Cairo governorate. Occurrence of Phytophagous mites on different varieties of soybean and their relationship with different fertilize levels. Effect of micro and macro elements of three soybean varieties leaves on the infestation of phytophagous mites T. urticae and E. orientalis under different fertilize levels.Effect of different kinds of soil and variety sensitivity of faba bean (Vicia faba) plants on the population of T. urticae under greenhouse conditions. The sam results was with Lentil (Lens culinaris Medikus) plants on the population of of T. urticae under greenhouse conditions.Biological aspects of the phytoseiid predaceous mites, Neoseiulus californicus and Euseius scutalis when fed on the two-spotted spider mite, T. urticae.Effect of prey density on the functional and numerical responses of the two Phytoseiidae mites, Phytoseiulus persimilis and Euseius scutalis. Effect of Abamectin, Nimbecidene and Priority on the population of Tetranychus urticae on green bean under field conditions.The present results revealed the following observations: -Mite incidence was conducted to identify mite species in Dakhlia and New Cairo from March 2018 to October 2019. Data showed that taxa reported the incidence of 73 species representing 50 genera of 22 families under four mite suborders. Actinedida was represented by 14 families, which having 34 genera and 48 different species. On the other hand, the total number of mite species belonging to the suborder Gamasida was 19 in 11 genera belonging to five families. Whereas, Oribatida had only three mite species belonging to three genera in two families, while Acaridida consisted of two species belonging to two genera under one family. Occurance of Tetranychus urticae on different varieties of soybean and its relationship with different levels of fertilizeThe two-spotted spider mite infestation was affected by soybean varieties and level of fertilizers. Soybean variety Giza22 was receiving the highest number of T. urticae followed by Giza21 during the flowering stages, while the lowest infestation was recorded on Giza111 variety. In addition, the upper level of fertilizer was receiving the highest infestation while, the lower level of fertilizer was the lowest infestation on all soybean varieties. Moreover, statistical analysis using correlation coefficient between mite populations and wheather factors showed that there was no significant positive correlation between the population of T. urticae on three tested soybean varieties and the maximum, minimum temperature and mean relative humidity. Soybean Giza22 received the highest number of mites with significant differences, while Giza111 infested by the lowest numbers. The mean population of T. urticae averaged 0.45, 0.76 and 1.25 mite individuals/leaf on Giza111, Giza21 and Giza22, respectively. Occurrence of E. orientalis on different varieties of soybean and their relationship with different fertilize levels.Citrus brown mite E. orientalis infestation was affected by soybean varieties and by fertilizers level. Soybean Giza22 received the highest number of E. orientalis followed by Giza21 during the flowering stages, while the lowest mite infestation was recorded on Giza111 variety. Furthermore, the upper level of fertilizer accompanied with the highest infestation, while lowest infestation was recorded with the lower level of fertilizer on all soybean varieties. Statistical analysis using correlation coefficient showed that there was no significant positive correlation between the population of E. orientalis on three tested soybean varieties and the maximum, minimum temperature and mean relative humidity. Soybean Giza22 received the highest number of mites while, Giza111 received the lowest number of mites..Effect of components of micro and macro elements of three soybean varieties leaves on the infestation of phytophagous mites T. urticae and E. orientalis under different fertilize levels. These results noticed that not to over-add the (NPK) and not to over spray micro (Fe, Mn and Zn) elements and adherence to the recommended concentration. Which leads to reducing costs and increasing the production rate of the soybean crop. Effect of soil kinds on the sensitivity of faba bean varieties (Nubaria1, Sakha and Giza 834) to mite infestation. Results indicated that soil type significantly affected on the population of spider mite T. urticae. Faba bean, which planted in sandy soil was highly infested. Also, there was high significant difference between mite population and faba bean varieties, and it could be concluded that Nubaria was the most preferred cultivar for mite infestation while Giza834 was more tolerant. The development of the predatory phytoseiid predaceous mites, N. californicus when fed on the two-spotted spider mite T. urticae, was accelerated with rising temperature. Egg incubation time was shortened by increasing temperature. Total duration of immature stages was longer for females than males. Feeding capacity of E. scutalis fed on T. urticae was highly affected by temperature. The total amount of consumed prey/predator at different developmental stages increased as temperature increased. The highest number of consumed prey was achieved during adult longevity. Effect of prey density (jostled) on the functional and numerical responses of the two predaceous mite species, Phytoseiulus persimilis and E. scutalis. There was a positive and high significant correlation was observed between the numbers of prey provided and killed by P. persimilis, which provided with one prey density (20 individuals) for (one male + one female; one male +two females; one male+four females and one male+six females). mean number of deposited eggs /days was highest at rate 1♂+1♀ of predator.When the density of one male + one female of P. persimilis, the mean number of T. urticae killed per day and the mean number of eggs laid/female increased by increasing prey density.The three bio-acaricides, Coromit (Abamactin) 1.8% EC, Priority fungicide (Paecliomyces fumosoroseus) and Nimbecidin 0.03% EC(Azadiractin) were used against spider mites at three concentrations (1½ of recommended concentration, recommended concentration and half of the recommended concentration). which can be integrated in IPM programs of spider mites.