Crystals on stems

Valencia, PA(Zone 5b)

Does anyone know what insect (etc.) leaves a white crystalline substance on the stems of the reproductive flowers? Also, what would leave white, hanging mucus drainage from young tree stems. I can find the aftermath but never the culprit. Thanks, Karen aka liebran

Union City, CA(Zone 9b)

maybe here
http://bugguide.net/node/view/15740

Valencia, PA(Zone 5b)

Thanks, I asked them the same question. We'll see if we get an answer. Karen (liebran)

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