I don't recall having whiteflies until about 5 to 8 years ago. Two things that might of made a difference are the neighbors putting in a small green house and my raspberry patch volunteered into the vegetable garden and I let them stay. Our winters have gotten milder too so maybe they are overwintering. I have an attached sunroom and have not noticed whiteflies there but if I overwinter plants I have aphids. I'm in a warmer valley than most parts of Wyoming and high desert.
Barb
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