Question
I have little worms eating my rosebush. the leaves are going fast

Answer
Worms are easy to get rid of just use any rose insecticide such as Ortho's Rosepride sprays for insects. But you can also use any organic spray that has Pyrethrum in it such as the Safers line for insects. Worms won't stay around for a long time and they certainly can eat a great amount of foliage in a short time, but they are easy to kill and don't need a very impressive spray to do it.