The effect of two natural agents (as adjuvants) on the efficiency of some insecticides (biofly, malathon, nudrin and challenger) were determined by using pneumatic knapsack motor sprayer(Kubota)at 95 L./ fed. against nymphal  and adult stages of Thrips tabaci  infesting onion and garlic plants .The additives used were bio new film(bnf) and glue .The results indicated  an increase of efficiency of the tested insecticides as  a result of mixing with these adjuvants. The effect of(malathon, nudrin, challenger and biofly after malathon) at 0.75 recommended rate on the initial percent reduction nymphs and adult stages of T.tabaci infesting onion at the  1^st season seemed to exceed the recommended rate when mixed with (bnf) which caused
59.79, 59.05 , 61.84 ,51.13 and 59.3 , 78.0 , 67.5 , 48.71 %, respectively .      The same trend were occurred approximately at the 2^nd season . Also ,similar results were recorded on garlic plants at the two studied seasons with slightly increase of efficacy. Bio new film exhibited an increase of initial percent reduction, but glue increased the residual effect.  In the respect to the yield of onion and garlic, the highest yield were recorded for plots treated with biofly(3/4R)after malathon(3/4R) mixed with glue (12.69,12.15 and12.34,12.64 ton /fed. )at 1^st and 2^ndseasons, respectively ,while the lowest yield was recorded for plots were treated with biofly which recorded 8.87,8.56 and 7.87,7.98 ton/fed., respectively. Therefore, it could be decided that the adjuvants (glue and bnf) mixed with the tested insecticides(3/4R)lead to high efficacy.