The present work aimed to study the effects of the royal jelly and honey at different concentrations , on certain biological parameters of the 5^th larval instar of the mulberry silk worm Bombyx mori L. The treatments with royal jelly and honey at different concentrations significantly increased both larval and pupal weights , together with rate of growth in comparison to the control . The results indicated leaves mulberry that treated with the royal jelly at both concentrations of 4 and 6 mg / 100 ml water resulted in pronounced significant positive high effects on these biological parameters .