I think we need a clearer picture to really be able to help you out. There is a good chance you don't need to spray anything. We know what that bug isn't. It is not an aphid, it is not a whitefly, it is not a mite, it is not mealybugs, it isn't a thrip.
A question, are you sure there are not aphids elsewhere on the plant? Typically if you have ants on your plants, you have aphids. Ants eat the honeydew that aphids leave behind (the stuff that causes that black sooty mold on trees is the honeydew from aphids as well). If its a fungus gnat, on an outdoor plant larger than a seedling, ignore it. They won't hurt your plant, more of an annoyance than anything. You can put diatamaceous(*sp) earth down under your plants and the fungus gnats will disappear (at least until the next rain)