>but I seriously lack the skills in dissecting and examining...
It can be tricky to remove the collar, but a quick diagnosis can be even made in the field.
Kill a bee, then remove the head and front pair of legs by using a pair of fine tweezers - put one arm of the tweezers behind the front legs and pull forward. This will expose the tracheae. A simple hand lens (10x or 20x) will then allow you see any bronzing or blackening.
Best wishes
Peter
52°14'44.44"N, 1°50'35"W
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