It was a brutal year for fireblight here, with the wettest spring in years. Resistant varieties like Goldrush suffered mightily, despite the trees being pruned to a very open style, quickly pruning out strikes and sterilizing in-between, and very little nitrogen.
The reason I went with G30 a few years ago was its fireblight resistance. Nevertheless, I think it was fireblight that killed two trees on g30 this year. Here's a picture of one of them right after I cut it down. My toes are right at the swelling where the graft was, and the bark cracked, and this canker appeared. If this is not fireblight, can somebody tell me what it was? Im pretty sure it was not collar rot, which I'm unfortunately also familiar with.