have you tried benificials? green lacewings or if nothing else lady bugs? They (whiteflies) will winter over in your greenhouse on live plants and weeds. is there anyway to clean out the house of all plants and freeze the entire structure for a few days this winter? start over with new clean plants. otherwise I suggest a systemic insecticide on everything to hit them all. even the weeds if you have even a few, but those need to be out of there no matter what. pull them and get that "habitat" eliminated.
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carolyn k
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