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This year both of our pear trees (especially our dwarf Bartlett) have a new foliar disease that I've never seen before. It looks a lot like edema with the bumps, but with a lot more discoloration and it affects the fruit, too. The darker discoloration was more common than the lighter not too long ago, I think (but they're both the same thing). The pictures aren't good; the leaves are a lot bumpier than they appear. We're getting rid of the most heavily afflicted tree tomorrow for unrelated reasons, but I'm still curious what this is.

Here are some pictures. It began around the time the blossoms were still on, I think.

Our pear trees are not close to each other. One's in the front and one is out back. They've both had fire blight before, but it went away.

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  • Shule, I don't think fire blight ever gets better or goes away. Are you sure these trees had fire blight? If I were you I'd get ahold of your closest Cooperative Extension Service. Would that be U of I? My University in Moscow, Idaho. Maybe even WSU? Cross my fingers. – stormy May 17 '18 at 9:26
  • I guess it could have been something similar. It made the branches/leaves turn quite black like they were burned, contagiously, and kind of gradually, but the trees seemed fine, if less productive, the next year. (Production seems more like normal this year.) Some of our apples had it more mildly. A landscaping friend said it was fire blight. I figured maybe it was the same bacteria causing this with different symptoms (that's why I mentioned it). I don't know which service is for my area. Probably U of I, if any. Do you mean the county extension office? – Shule May 17 '18 at 10:18
  • Cooperative Extension Services have a University base. Not county. For you it just might be U of I but WSU has a powerful and wide spread Coop. Ext.... – stormy May 18 '18 at 0:40
  • The remaining tree was showing fireblight symptoms again. I'm guessing it was just latent last year. So, I cut it down. That's our last tree! – Shule May 26 '18 at 2:39
  • en.wikipedia.org/wiki/Sambucus This MIGHT be a safe replacement that i think you might love. Take note about the 'toxic' part of Elderberry, people need to heed these little details, but what a producer of berries. Have you had Elderberry? You shouldn't plant anything in the rose family as fire blight will be forever in that soil. Killing the bacteria of fireblight...Erwinia amylovora would kill all life in the soil if you had to grow fruit trees in the rose family. Elderberry makes a great 'grove'....a 'true' food forest. – stormy May 26 '18 at 8:50

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