Wheat (Triticum spp.) is one of the most important cereal crops world-wide and it is grown in many countries. Their yields have decreased significantly in the last century, mainly due to different factors including insect pests like wheat aphids. The experiment was conducted during 2018 in West Shoa, Ambo and Toke kutaye districts, Ethiopia . The experiments were laid out in randomized complete block design within three replications. The result revealed that the newly introduced seed dressing insecticide (Seed star 24% FS) and Titan 25 WDG gave promising results during the study period and significantly (P < 0.05) different from untreated control. The tested doses of 1.75lt/100kg and 1.5lt/100 kg of Seed star 24% FS resulted in 3713.67 and 3915.33 kg/ha yield, respectively. Similarly, the highest (300g/100kg) rate of Titan 25 WDG also gave 3813.33kg/ha and no significant (P > 0.05) difference from the standard check (Pro-seed plus 63 WS), which caused 3880.33 kg/ha. The mean population number of Diuraphis noxia 20.67 and 16.33/plant were recorded at rate of 200gm/100kg Titan, and 1.25lt/100kg of Seed star 24% FS, respectively. Therefore, Seed treatment insecticides gave suitable and reliable control of D. noxia and found to be safer to human beings and natural enemies compared to the foliar application of insecticides.

Keywords: Diuraphis noxia, Seed star 24% FS, Titan 25 WDG, Yield, Yield loss.