Cankers and galls on shrubs

Wed. Feb. 1, 2017

Click below to listen to my Garden Bite radio show:  Cankers and galls on shrubs

Do you suffer from galls or cankers?

I just have to grin when I hear that.  The thought of some medication commercial coming up with side effects so horrific, I’d rather have a canker!  Maybe…

With all the leaves gone on our trees and shrubs, it’s a good time to take a careful look at their branches for galls or cankers.



Cankers and Galls [University of Minnesota Extension] This link will take you to a wealth of information!

Black Knot

Black Knot

There are numerous types of cankers and galls caused by a variety of reasons.  The important thing to remember is that they cut off the water and nutrient flow to the branch, girdling it.  This will eventually kill the tree.

Pine oak rust gall

Pine oak rust gall

Burn or bury any cankered branches.  This will help with disease management.  Don’t compost them.

When you make a pruning cut, be sure to disinfect your pruners with rubbing alcohol or Lysol.  You can also use a 10% bleach solution but this tends to rust your tools.  (do not use Pine Sol – it’s too corrosive)

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