The aphids are back

I was moving stuff around on the balcony and I put the basil up one a small bench to get it more sunlight. Once up there I had a better look at it from a different angle and there they were. Aphids. Just one plant. So I pinched off the top and tossed it. I didn't find any more on plants in that same container but in another container I found more on some fino verde basil. I don't think there is anything else in that container they like or can harm so maybe that 's where they'll stay. But I've been through this so many times in the past and I know how it ends: a complete aphid infestation. They can have the fino verde, but I won't be happy if they take over the Genovese.