The population fluctu-ation of the two-spotted spider mite, Tetranychus urticae Koch on peanut, Arachis hypogeae L. cv. (Giza 5) was studied in a semi-arid newly reclaimed land (Arab El-Awamer Abnob, Assiut Governorate) during 2006 and 2007 growing seasons.  Peanuts plants are subjected to the infestation with different stages of the two-spotted spider mite.                 The infestations with different stages of T. urticae were noticeably high from early July until the end of August, then relatively decreased until the harvest by early September.  The stages of the two-spotted spider mite were traced on peanut during 2006 and 2007 seasons in relation to plant age.  It was evident that, the highest average numbers of the two-spotted spider mite stages was (33.50 and 39.75 eggs on 63^rd and 98^th days of plant age), (31.25 and 37.00 larva on 63^rd and 98^th days of plant age), (28.75 and 31.50 nymph on 63^rd and 98^th days of plant age) and (25.50 and 24.50 adult on 63^rd and 98^th days of plant age) during the two successive seasons 2006 and 2007.                 It's also, notice that, the total average numbers of the two-spotted spider mite stages infested peanut was much higher in 2007 than in 2006 and the highest peaks were recorded in July 18 and August 23 (119.00 and 132.75 individuals) throughout the two successive seasons 2006 and 2007. Therefore these periods are considered the best time for mite control on peanut plants.  The investigated was left to natural infestation without using any pesticides.