i don't know resistant cultivars to recommend but it is easy to treat with a fungicide. i think i have used funginex with good results. you can pick them off before they mature to reduce populations, too.

Hi Jeff
I handpicked galls every day for about 6 weeks the past 2 years and finally got tired of it. I have close to 50 azaleas and rhodos and if you miss even 1 gall, its enough to keep infecting everything downwind. The first day here I picked a gallon bucket. Now thats disgusting.

I used Funginex also which helped during the same year, but it doesn't stop the infection for next year. The spores lodge in the leaf petiole and infect the plant tissue, but they don't make galls till the following spring. The funniest thing I found about these things is that the French consider them a delicacy. Between the slugs and snails and azalea galls they could dine for a long time at my house.

I feel your pain...
I spent about 2 hours today to trim 3 Girard'd Pink and finally gave up... 4' tall shrubs become 1' bunch of twigs.
With 60 to 70 azaleas and rhododendrons in my garden I can't afford to have this desease to become a wide spreading problem.
And to the garbage they went...

*lol* at the alternative cuisine!
have you tried them? ;-)
perhaps i am growing somewhat-resistant azaleas because it just never gets to the point where i consider removing the entire plant and, with our humidity, it should be a perfect enviornment for this fungus. maybe it likes your climate better?
i did find a list of azaleas that are ranked by susceptibility.

Here is a link that might be useful: vermont extension service publication

I just live with it although I do pick some off but not in a determined manner.

I had success controlling them by hand picking and pruning for a more open shape to increase circulation. I have about 12 azaleas and 6 rhodies on my quarter acre, but only a few azaleas have been infected. They have not come back to the same plant a second year, but they have moved on to a neighboring one.

You may not be looking for this advice, but one of the problems with growing a lot of the same plant in a garden is that controlling a disease or insect infestation becomes more difficult. Maybe this is an opportunity to diversify?

Karchita
You'll appreciate my replanting - I put hellebores underplanted with european ginger