The present investigation was carried out at the ornamental flower farm in Abu Galeb village, Giza governorate throughout two successive seasons (2013 and 2014).The experiment studied the effect of four different pesticides (Ashok, Bovaria, Mlathion and Actara) under five different fertilizer levels on the population density of the onion thrips Thrips tabaci (lind.) infested Gladiolus sp.(Iridaceae). Obtained results during two seasons indicated that, the most efficient control agents after general mean of 14 days of spraying was Ashok for non fertilizer (0,0,0) the reduction percentages was %68 of T. tabaci on 2013 season and % 76 on 2014 season, respectively. on the other hand, the least potent was Mlathion for non fertilizer (0,0,0) the reduction percentages was 48%  of T.tabaci on 2013 season and % 43 on 2014 season, respectively. After general mean of 14 days of spraying.