author(s)
Alok Kumar, Jitendra Kumar, Vikas Kumar Rai, Vivek Kumar Patel, Santosh Kumar and Abhay Kumar

abstract
The bio-efficacy of the treatments evaluated against aphid on barley crop showed that lowest population of 2.20, 2.80, 5.73, 12.13, 12.20, 25.70, 30.13 / shoot. was recorded in flubendiamide 480 SC @ 250 ml ha^-1, imidacloprid 17.8 SL @ 100 ml ha^-1, acetamiprid 20 SP @ 100 gmha^-1, chlorantraniliprole 18.5 SC @ 100 gm.ha^-1, Metarhizium anisopliae 1×10⁸ CFU/gm.@3.0 g. lit^-1, Beauveria bassiana 1×10⁹ CFU/gm.@5.0 g. lit^-1 and Azadirachtin 1500 ppm (0.15%EC)3.0 ml.lit^-1 respectively and were found statistically at par in their efficacy. The highest aphid population was recorded in untreated control (61.60 Aphids/shoot). The data of seed yield revealed that maximum yield of(50.38 q ha^-1)was recorded in the plots treated with in flubendiamide @ 250 mlha^-1 followed by imidacloprid @ 100 mlha^-1, & acetamiprid @ 100 gmha^-1, which gave (50.10 q ha^-1& 49.21q ha^-1) seed yield, respectively and all these found statistically at pareach other and proved significantly superior over rest of the treatments.