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RE: Natural Aphid Control with Aphid Hunter Wasps
Build it and they will come! I am sure you have some around they are so small that they go unnoticed. I have difficulty telling for sure what they are until they land at the nest entrance. Sometimes I don't even see them at all and only notice that the hole has been sealed with little pebbles or chewed up leaf bits.
I will have to keep an eye out for them, I checked into buying them but they are expensive!