As the snow peas were nearing the end of their life this spring I started to notice some aphids. They never got to the tomato plants (at least not that we saw) but I didn't want to risk an infestation like last summer.
I ordered another container of lady bugs from Amazon since we had such great luck with them last year.
You are supposed to release them at night so that they stay in the garden and do not fly away.
They wanted out -- BADLY!
And the next day we still had tons of lady bugs and haven't seen any more aphids since.