ABSTRACT A biological program was applied on Nili maize plantation of 2018 and 2019 by releasing the egg parasitoid, Trichogramma evanescens (two releases at rate of overall 55000 parasitoids/ release/ feddan at 7-day interval) and applying Bacillus thuringiensis var. kurstaki to control O. nubilalis. Releasing at a rate of 55000 wasps / feddan induced rate of parasitism in Trichogramma and Trichogramma combined with B. thuringiensisplots by 72.87 and 70.69 % in 2018 and by 75.12 and 73.67 % in 2019.in the combined treatment (T+B.t), the mean percentages of infestation by O. nubilalis larvae at harvest were 15 and 20 % in 2018 and 2019, respectively showing a reduction in the infestations to ears by 70 % and 66.67 % in the two years, respectively. One Bacillus thuringiensis treatment was not sufficient to prevent the larval attack to maize plants. This treatment led to lower reduction of mean number of larvae/15 plants (31.13 % and 34.09 %) and% reduction in infestation to ears by (10 % and 16.67 %) as compared to the control in 2018 and 2019.