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Yellow rust on raspberry has been a common issue of concern for growers and PCA's this past week, very likely this has been spurred on by the wet weather of this past winter.
Recommendations for management available at the UC IPM guidelines
http://ucipm.ucdavis.edu/PMG/r71101111.html
The pictures below are of what some of this rust manifests itself as. Viewing the leaf from the top, one sees an array of darker spots over a lighter background of the chlorotic leaf (not diagnostic, nor do I make any pretensions that this is being caused by the rust disease). Turning the leaf over, one can see the masses of pustules growing at these very spots.
Yellow rust affected leaf; top view.
Yellow rust on raspberry leaf, bottom view.
