Marigolds are supposed to repel insects.
Otherwise, a good shot of carbaryl will get it...or imidicloprid...
Did you enjoy "Das Boot"? LSA
Huh...I never knew that! So planting marigolds in the cinderblock holes when using cinderblocks for a square-foot garden is about more than just makin' the border purty? I hadn't realized. Purty is a definite bonus, though...