Steve wrote in message ...
Ben Sharvy wrote:
.............................
The currant isn't susceptible to the disease at all. It is strictly a
carrier...........................................

Well that certainly isn't true. Currants do get the disease and are
damaged by it. It may not kill the currant as it often does the white
pine, but it does get the disease.
I just did a search and the first site to come up happened to be from
the place where I spent the last 4 years of my college career:
http://ohioline.osu.edu/hyg-fact/3000/3205.html

Hm. I stand corrected!