Pest control oils "need to be sprayed directly on the pests, to be effective," writes Marie Iannotti. But pest control oils can be confusing to beginners. With labels like "dormant oil," "summer oil" and "superior oil," who's to know which is which? Well, About's Gardening Guide knows, and she has all the answers in this article on pest control oils.
In May, I had to spray a pest control oil on my ninebark shrub. I found it suddenly infested with aphids one day! I'm glad to report that the pest control oil did the trick.