I bring house plants in for the winter. I use a systemic insecticide on them. I would never use it on an edible plant. I have learned the same lesson as you have. I never had aphids go too crazy in my greenhouse but, I will never grow tomatoes over winter again. I had white fly from them so badly that they went after all my young seedlings. I do over winter pineapples. They do not seem to attract any insects. My main problem now is fungus gnats. I am able to control them but can never quite get keep them from getting in my greenhouse. I empty and sterilize every spring but still manage to get a few. And a few can turn into many if I am not diligent.
