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Plum Tree Problems

Posted by mattyt Pa (My Page) on
Wed, Jun 12, 13 at 17:59

I have included a picture and I believe this is black rot correct? I have pruned back the branches infected last year and it is back again. What can I do to rid myself of this issue.


Follow-Up Postings:

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RE: Plum Tree Problems

Yikes! That's a bad one. The term iirc is Black Knot.


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RE: Plum Tree Problems

I believe all you can do is cut out the Black Knot a few inches below the thing. (Make sure you sterilize the cutter before and after with alcohol or something.) And look up a fungi spray to try to prevent it reoccurring.


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RE: Plum Tree Problems

I believe all you can do is cut out the Black Knot a few inches below the thing. (Make sure you sterilize the cutter before and after with alcohol or something.) And look up a fungi spray to try to prevent it reoccurring.


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RE: Plum Tree Problems

Keep the tree growing vigorously and cut that stuff out as soon as it appears deep into clean wood. You use a sharp knife and cut well beyond the galls themselves when you aren't removing an entire branch. When it appears again, cut again. Collect and dispose of infected wood.

I spray the wounds I make with chlorathalinal, which may help. Cornell suggests spraying entire trees with it in early spring as a partial help.


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RE: Plum Tree Problems

My plum had loads of BK last year, after butchering the tree I sprayed with Lime sulphur and Dormant oil in the fall, and again before bud break. No sign of it this year, but no plums. Should be good next year as I have lots of new clean growth.
Nasty stuff.


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RE: Plum Tree Problems

Interesting. We get a ton of black knot around here on other Prunus like maydays and Schubert chokecherries, but I've never seen it on my plum trees and I didn't know it could infect plums. When you prune it out, diluting regular laundry bleach with 10 parts water makes an effective sterilant for your cutters between cuts.


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