Kretzschmaria on walnut advice please?

[TreeAbility]

Surveyed a beautiful walnut today with big pocket of decay. Buttress roots are fine, decay is between the buttresses so was thinking maybe reduction to retain it. Then pulled some dead Ivy away and found Kretzschmaria on the side. Sounding test seemed good but not sure how aggressive the Kretzschmaria is going to be. 

Could recommend decay detection or just remove as it's close to buildings. Would be nice to keep it if possible

Any thoughts appreciated! 

[AJStrees]

Lovely big tree. Not looking happy on the bole. I had a large lime come over in the last storm. Was hollow at the base where the kretz was. Totally hollow, but no sign of it being hollow from outside before it fell. Rest of the tree from about 5' up was totally sound wood and solid. 

 

Picus and Resi Drill might be an idea to see how far the decay has progressed. Seems a shame with such a big walnut. But with that much Kretz at the base I would be quite concerned. That's my laymen's opinion on the matter. 👍

[daltontrees]

ooft, that's a loty of Kd for a top-heavy walnut. Electricity substation in the background.

 

Walnut seems to carry on for ages when there's not a lot left but Kd takes no prisoners. Is that more Kd at the right just beside the clipboard behind the ivy? Looks about ready to snap...

 

If you reduce it so much that there are no targets left but grass, could keep to the bitter end, which with that much crown removed won't be to long.

 

OR remove completely, salvage as much wood as possible and replant. Good thing about Walnut's aggressive allelopathy is that it clears the whole area of competing vegetation, but if you remove and replant you might want to leave a season until the juglone in the soil breaks down. Otherwise it could impede establishment of new planting. I have no evidence base for that except that Walnut really is fabulous at excluding everything else around it.