Survey and population fluctuation of phytophagous mites were carried out during two successive years (2013/2014) and (2014/2015) in four localities (Qena, Kaft, El waqf and Nag Hmady) at Qena governorate on mites associated with tomatoes(Lycopersicon esculentum) and Pepper (Capsicum annum); the results revealed that, nine mites species belonging to( Tetranychidae, Tenuipalpidae, Eriophyidae and Tarsonemidae) were recorded infesting tomatoes and Pepper also the study indicated that, the population fluctuation of these mites recorded high population in September of the summer season 2014 and 2015 with average 153.25 and 146.75 individuals / 25 leaves respectively on tomatoes plant; while in the winter season were high population in February and December 2014 with average 76 and 137.75 individuals / 25 leaves respectively on the same plants. in pepper plants, the population of mites was a very low number compared with tomato plants in the summer and winter seasons it were 15.5 individuals / 25 leaves in March 2015 and 13.50 individuals / 25 leaves in February 2014. The results were a significant correlation between phytophagous mites, Temperature and relative humidity.

This study aims to study effect of replacing soybean oil (SO) by rice bran oil (RBO) at levels (25,50 and75%) on physical, chemical properties, fatty acid composition and oxidative stability of SO and study the effect of storage at ambient temperature for 12 month on Free fatty acids content (% FFA), Peroxide value (PV) and Thiobarbituric acid (TBA) of SO, RBO and their blends oils. The RBO was of a good quality, as evidenced by its low initial values at % FFA, PV and TBA and has been recognized as an excellent source of γ oryzanol, it had the γ oryzanol meanwhile the other oils don’t contain γ oryzanol, Thus, the SO containing a higher amount of RBO leads to the least degradation, while pure SO has the highest, also had more inhibitory effect against oxidation due to a prolongation of the storage period without use of industrial antioxidants. FFA% and PV of all tested blends oils samples during the whole storage periods were found within the limits recommended for human consumption. TBA went in a parallel trend with those of PV. On the other hand, a gradual rise in TBA values was observed with extending the storage period of oils. In SO, the TBA increased from 0.533 mg malonaldehyde /kg oil at zero time to 1.446 mg alonaldehyde kg− 1 after 12th month of storage. While it increased from 0.336 mg malonaldehyde kg− 1 oil at zero time to 0.882 mg malonaldehyde kg− 1 oil after 12th month of storage in RBO.