"BIOLOGICAL CONTROL AND ERADICATION OF FERAL HONEY BEE COLONIES ON SANTA CRUZ ISLAND, CALIFORNIA: A SUMMARY" documents an effort that continued to find honey bees from 1988 to 2004 despite every effort being made to eradicate them.
https://static1.squarespace.com/static/60a6b9c6059cad3139d4d98b/t/615dd7a29fa0066370c67a2d/1633540002557/Wenner.pdf
The term "efficient" does not seem appropriate for an effort that spanned 16 year.
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