I would suspect at this point that it's too late for an answer to do you much good for this season, but I'll give you a recommendation to keep in mind for next year.
I use Bayer Advanced products. There are several products they make which will do the job, roughly the same chemical ingredients just different names. They contain 2 active ingredients, cyfluthrin and imidacloprid. These are a double whammy product, one chemical is a contact poison, the other is a systemic poison, the plant soaks it up and distributes it to all of it's tissue, thus making the entire plant poisonous.
They come in sprays, soil drenches and granules, read the labels or ask knowledgeable staff to determine which is right for you.