General Discussion:

Plum tree fungus

Messages posted to thread:

Wayne18-Aug-03 12:28 PM EST 4   
Nancy18-Aug-03 02:51 PM EST 5   

Subject: Plum tree fungus
From: Wayne
Zone: 4
Date: 18-Aug-03 12:28 PM EST

I have a fungus like growth on the branches of a plum tree. What is it and how do I get rid of it? All the plums failed to develope this year, is this the cause?

Subject: RE: Plum tree fungus
From: Nancy
Zone: 5
Date: 18-Aug-03 02:51 PM EST

Sounds like black knot, which can be a huge problem. I have it in a couple of my plums too. Your best hope for controlling it is to cut off the affected branches. Make sure that you sanitize your pruners between cuts (I use a bleach solution), cut about 6 inches back from the fungus, and do not compost the cut sections (burn them or put into municipal waste). I'd also suggest using a lime sulphur spray in the early spring.

The fungus may not be the reason you aren't getting plums. I find with even my unaffected tree, there are good years and bad years. I seem to get a good crop every three years. This year wouldn't have been a bad one, if only the blinkin' raccoons hadn't arrived one night and stripped the tree on me, just as the fruit was ripening.

Good luck with your plums.

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