Thanks guys,
I discussed trunk banding with the company that comes over from the mainland to do soil injection and he said for large elms its almost a waste of time. Either the larvae clump at the top of the band and drop down below it and continue, or crawl under the band in the deep fissures...
Ok, so I have started doing stem injection treatment for Elm leaf-beetle.
I'm using the 'Wedgle Direct Inject' system which only has a small hole that goes in as far as the the bark/wood interface.
Elm beetle will probably be around for many years to come, and I anticipate having to re-inject...
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