Hambone,
In my experience I believe there are different strains of the same disease. Some of those can be real nasty. Some people discuss Fireblight resistant pears but it might be worth it to look at this post Pear tree Fireblight research so you dont have to . My hope is the disease will become smarter over time as most do. A good bacterial disease does not kill it’s host. This is a stupid bacterial disease because once it kills it’s hosts it has nothing to live on.
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