Insect and Spider Identification: Caterpillars (or worms) eating my marigolds - what are they?, 1 by kpearse

kpearse wrote:
I've attached a photo of the little buggers.
They are about 1/2 to 1 inch long w brown stripes.
They're on my marigolds in flower boxes & on my potted daisies.
They seem to burrow into the flower & right down thru the stem, leaving behind pepper-like excrement along with a rotten flower.
Help!
I've tried spraying with Ortho max bug be gone (local nursery sold me) - but they're still here!
How do I get rid of these things before I have no flowers left???