Hi, Clara. I don't think brands are an issue. Where to buy them, maybe.
I would definitely go with a systemic or translaminar insecticide like acephate or imidicloprid, although being a neonicotinoid, the latter is bad for the bee population.
In any case, treat the plants by wetting every surface and drenching the potting medium. Repeat two more times at one-week intervals.