Population fluctuations ofThrips tabaci was studied during the two successive seasons, 2017/2018 and 2018/2019 on two varieties of strawberry plants; Festival and Fortuna, at Shebin El-Qanater, Qalyoubia Governorate, Egypt. Thrips tabaci Lindeman (Thysanoptera: Thripidae) is a serious insect pests affecting strawberries in all stages of growth. The seasonal abundance of this species was higher during the second season than the first one (the total numbers of 5631 and 6086 individuals respectively). The population of Thrips tabaci showed two peaks, the higher one was recorded in the 1^st week of December during the two seasons of study, while the lower one was recorded in the 3^th week of march during the two seasons of study. Statistical analysis indicated that there was a highly significant relation between the insect numbers and the age of the plant, while this relation was insignificant for each of temperature, relative humidity and wind velocity. The combined effects of temperature, relative humidity, wind velocity and plant ages on thrips activity were (81.2 %) and (92.7 %) during the first and second seasons, respectively.