Answer: I understand your frustration with mealy bugs and I don't really have an answer to your concern. I know that female mealy bugs can crawl between the slats of a growing bench and remain undetected and she can then crawl up and populate any new plants placed on that bench. The only answer is sanitation of the greenhouse between plant crops, and careful monitoring of all plants that are growing in the greenhouse. It sounds as though you're doing everything right - checking new plants before introducing them to your own greenhouse and monitoring those plants that you already have. Wish I had a more permanent solution for you!
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