Please advise on Bacterial Canker on Interspecifics


Here is a pic of some serious borrer damage in my own backyard. This tree has suffered as many in my backyard from under irrigation. Drought has been tough on these trees but the fruit is fantastic! I will cut this out today! It’s a mess!!


My operation was a success. The tree is slowly closing up the wound. I’ll try to remember to post pictures tomorrow. After I cut out the infection on mine, we’ve had hail so many times since and the trees have ended up pockmarked and oozing gum. I know it’s a defense mechanism. It’s hard to tell what yours is exactly. It could be borer or canker or a bad union as Alan suggests. I’d recommend at least doing a copper spray.


sounds brilliant. any genius of the obvious is a natural gardener.


An update:

This is the same cut, one year later. Coming along nicely.

We’ve had hailstorms here way too often resulting in pockmarks all over the trees, like this one. I kinda want to cut it out. ~1" across.

This second tree was partially girdled by rabbits last year (also a Flavor Grenade). About a third of the way around the tree.

This is the same girdled tree one year later. As you can see it’s almost completely repaired the damage over one season.

I still need to repaint the trees this year.


That first pic is creepy! Looks like some dude is inside the tree. Look at that nose!


It’s not his nose, it’s the hoodie that looks threatening.


@dwn How is your cankered tree doing now?


Canker is fine but I have no pictures. I need to find a fertilizer regimen that works. Lots of vegetative growth but not much fruit set. Partly due to low pollination and flowers being freeze killed. Greatest disease pressure is black knot now. Funny that I have pollination problems with Flavor grenade. I have also a Peacotum and it managed to set a couple fruit this year despite I would expect more problems from it than the Flavor Grenade.


"Petrolatum, latex paint, shellac, and asphalt compounds did not promote wound closure’

This is from the article Scott posted. I don’t believe you are correct to suggest paint doesn’t hold in moisture- pruning compounds dry out just as much as paint. What is new in the info is a couple of very specific diseases that may be blocked out with paint or shellac that probably aren’t going to be an issue with the vast majority of growers on this forum (certainly doesn’t affect my orchards).

Instead of trying to cover all the angles on what has a chance of being of use, I think for anyone without a whole lot of spare time on their hands the best bet is to follow the guidelines provided by the nearest land-grant university, or the one most similar in climate to you- or just ask a knowledgeable commercial grower, if any are producing fruit near you.