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Is this fire blight?

last year

Hi, I live on the CA coast 1 hour south of San Francisco. I have a 40 tree fruit orchard. It's mostly plums, apples and pears. This year has been challenging with all sorts of diseases. My little Wickson apple now seems to be attacked by fire blight for the first time ever. Do I have this right? If so, should I cut the whole branch off? I don't use any non-organic approved sprays, although as far as I know, this wouldn't help with fire blight anyway. Or is it something else?

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