I looked through the pictures in my copy of "Compendium of Raspberry and Blackberry Diseases and Insects" for something that looked like Ginda Fisher's description. The only match seems to be Rose Scale. "Small white circular structures on the cane but may cover much of its surface. These scales generally occur at the base of the cane but may cover much of its surface. In severe infestations, the scales may overlap and completely cover and encurst the bark, causing the cane to look white-washed".
Google search among other things turned up a list of links to photos: http://www.insectimages.org/browse/subimages.cfm?SUB=8312
If that's what it is, control is listed as removing and destroying canes, liquid lime sulfur in dormant season, and standard insecticides. "The elimination of wild brambles near cultivated plantings may also be beneficial."
Pete Tallman
Longmont, CO
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