I have a recurring problem with cucumber beetles. My plants look great but then the cucumber beetles cut the stems and they slowly die. I've heard that if I don't plant cucumbers for a couple of years the beetles will die off. But I love having cucumbers growing in my garden! This year I got some neem oil spray to try to save them, but I may have gotten to them too late or it just didn't work. Is there anything I can use to get rid of them once and for all?