Ray,
2 years ago I had two trees suddenly hit with Fireblight and they were very ill with it. One was a Kieffer and the other a clapps favorite. It appeared systemic. I read online bacteria was very sensitive to vinegar. Mixed the sprayer with 50/50 white vinegar and water and sprayed them which caused the leaves to develop black spots that went away later but the Fireblight stopped and never progressed farther. I realize vinegar is a mild weed killer but if you get desperate try it. I had trees killed to the ground with Fireblight several times and I’m convinced those would have been killed had I not gave them the vinegar and water bath. There a few posts on the internet where I got the idea. I have several trees each year or more that I use the vinegar on. The trees won’t look nice but none that I sprayed died and that was better than the alternative.
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