You might want to edit your post to add the insect forum.

Where are you located and how big is that chunk of a critter?

tj

Ok thanks I will do that.

Cheers are in the interior of British Columbia, in the South Okanagan, zone 6 but its normal to have August temps above 35 degrees c. The bluey coloured part is about the size of my pinky finger nail...

Here in PNW, south end of WA state many birches of various kinds have been weakened, damaged or died from the Birch Borer insect…. check pictures at this linkor just Google Birch Borer here’s images I found Pics of birch borer

ETA link didn’t work so try this one

Birch borer info

i would use a systemic drench and pray ... check bayer tree and shrub and see if it rated for such ... and it might be tricky to apply to the ground.. since there is a bit of a hill ..

i might also talk with your seller.. but you ae past the presumable year warranty ...

i think i can barely see healing in there... the cambium layer is just below the bark.. and it is the vascular system of the plant... moving water up.. and storing energy down.. that your canopy has had problems.. means the cambium has probably been seriously compromised ... so im not holding out a lot of hope for the future ...

and i dont want to recommend you go removing more bark to find out ...

if you are willing to invest.. treat the tree with a systemic for borers ... and as noted above... pray ...

i also cant see the root flare... that isnt helping...

and as with all drip irrigation.. i wonder if water is getting down thru the whole root zone with a recent tree transplant ...

ken