Thanks for your raspberry leaf spot question.  Your photos are greatly appreciated.  It has been a particularly wet winter and continual spring rains in our region, making ideal conditions for fungus growth in red raspberries.  Raspberry-yellow rust is a fungus, phragmidium rubi-idaei.  Cultivars such as Canby, Chilcotin, Newburgh, Puyallup or Sumner have been resistant, although new fungus strains will infect previously resistant cultivars such as Meeker and Williamette.  The fungus overwinters as teliospores on leaves and in spring create a yellowish spotting on the upper leaf surface.  Initially they are small, then yellow to orange and raised.  The fungus progresses and fruit often dies on the canes before maturing and by harvest the black overwintering spores appear for another year.  All parts of the plant are subject to infection. 

Our OSU Pacific NW Plant Disease Management Handbook makes the following Cultural Control recommendations:

• Burying fallen leaves, old cane stubs, and refuse before new leaves appear will help eliminate inoculum sources.
• In home gardens, destroy fallen leaves and other refuse.
• Remove and burn old fruiting canes as soon after harvest as possible, cutting flush with the ground. Cultivate as soon as weather permits.
• Strip leaves from primocanes before tying.
• Postpone trellising primocanes until leaves drop off.
• Primocane suppression eliminates susceptible tissues when rust spores are present on fruiting cane leaves.
• Control cane vigor to improve air circulation in the plant canopy, which hastens drying of leaves and canes.

The recommended Chemical control is:  A delayed dormant application, using Bordeaux 8-8-100 or Rex lime sulfur (28%) at 8 to 10/gal/100 gal water with 48 hr. reentry (organic).  Wait until the first buds produce about 0.75 inch of new growth.

Eating raspberries from your own home garden is worthwhile and it’s tough when a never-ending rain season endangers a successful harvest. 

You might also find useful, the Oregon State University Extension guide “Growing Raspberries in Your Home Garden” catalog number EC 1307 at http://extension.oregonstate.edu/gardening.