Whatever you chose to fight them with, be sure to do regular applications (unless recommended not to on the instructions) to make sure to upset the life cycles.
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Just one example: with neem, you need to spray every 3 days and for at least three applications. (Other chemicals/soaps may have different methods similar to this, but be sure to do research on whatever you use. Utilize the search feature within the forum - type the spray name that people recommend and see what other people have to say)