Bruce, forgot to mention, I have two 20" fans working 24/7 and rotating air, so air movement not a problem in my greenhouse. Thanks

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Actually STB was right, I was following suggestion from Mr. Tom Harper, orchid grower with 40 years of experience and judge from Atlanta Center of AOS and ran little test with piece of white tissue moistened and dragged across the leaves. The red stain and little dots were actual mites. Any preferences on miticide? Thanks