Zinnia Problem? I'm having a problem with my zinnias. Small 1 cm brown striped worms...

I'm having a problem with my zinnias.

Small 1 cm brown striped worms are consumption the centre of the flowers. They leave a brown residue that have a resemblance to dirt and also attack the buds before they open.

Suggestions for removing them would be appreciated!
Pruning a weeping birch tree.?
Answers:    spray the flowers near soapy water or a cayenne pepper water mix ...these are natural approaches instea dof using pesticides...also, pick off all the artificial buds so it doesnt spread to the healthy flowers