Just did a search for you. According to this info, Sansa is moderately susceptible while Gala is very much so.

Here is a link that might be useful: relative FB reisistance

Thanks Hman, It's funny that I had to remove Gala, but the Fuji that I have has been totally FB free, and both are highly susceptible. Since it's only a scion graft and not a whole tree, I think I'm going to take a chance.

As the years go by and you have more time and varieties by which to study fireblight, I bet you become more confused by this truly zany pathogen. It may be well known what conditions make infections possible, but the why, which, and where it strikes is way beyond my comprehension.

One site will have a lot of fireblight on several varieties one year and even though I make no great effort to remove cankers that have moved from shoots into wood there will be no FB the next year (customers don't always want to pay for suggested treatments) while a few miles away trees will be hammered that had no infection the previous.

Same thing goes for varieties affected, where a Bosc pear at one site will be killed while a Seckel right next to it isn't touched and at another site it's the other way around (although in general Bosc seems much more susceptible).

The site where I had the worst fireblight this year never had it before in the 15 years since I planted the orchard. A site 10 miles away had it terrible last year but not this one. This happens frequently and the pattern is no pattern.

Now if I managed commercial orchards I'm sure the patterns would be more predictable where there are rows of same variety trees abutted against other varieties on a huge scale. So it's probably best to go by the observations and data derived from commercial production on this one.

Sansa never got any FB in my orchard. One more small data point.

Scott