|To:||Charmian Lawson <>|
|Subject:||Not birds - but advice appreciated|
|From:||Denis Wilson <>|
|Date:||Fri, 10 Jun 2011 16:20:40 +1000|
It is a grub, a "borer", but not a furniture borer - a large one.
Quite likely a Longicorn Beetle has laid an egg on the bark, and the grub has entered.
More to point, it has also left.
You could try adding grafting mastic, to try to protect sap flow in the cambium layer, but I suspect the damage has occurred already.
Consider amputation of the damaged limb - of the tree.
Difficult to protect future attacks, but you need to look for smaller holes covered by "frass" - the chewed up bark and insect poo.
That's the sign of entry.
Scrape it away, and stick a soft wire inside to assess how deep the hole is, and maybe to "spear" the grub.
Some people pour insecticide in the hole (squirt it in with a spray bottle).
There is little point in spraying the entire tree, as you poison the outside, but not the inside part of the tree where no sap flows.
Best of luck with it.
On Fri, Jun 10, 2011 at 1:55 PM, Charmian Lawson <> wrote:
"The Nature of Robertson"
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