DND, I had the same problem earlier in the Spring. I get a heavy infestation pretty much every Spring. I always say I'm going to spray but never do. I just wait a few weeks until the ladybugs come. They came in droves this year! Aphids can really damage susceptible cultivars (cause all the buds to blast) but they can't kill the plants. Even with a heavy infestation 99% of my plants bloom fine after the ladybugs come. Now if you don't have ladybugs or other predators you have no choice but to spray. Not to say your spray is bad! But I hesitate to spray because I figure if I get rid of too many aphids my yard won't be as attractive to ladybugs.
