Borate and imidacloprid treatment of ash logs infested with the emerald ash borer

As of January 2006, portions of Indiana, Michigan, Ohio, and Ontario were infested with the emerald ash borer (EAB), Agrilus planipennis, a destructive exotic Asian beetle that feeds within the inner bark of ash (Fraxinus) trees. This project evaluated borate (dissodium octaborate tetrahydrate) and imidacloprid to sanitize EAB-infested logs, which would then facilitate log transport to mills outside the quarantine zones. EAB-infested logs were cut in winter and then spray- or dip-treated with either borate (1% to 5.5% BAE [boric acid equivalents]) or imidacloprid (0.01% to 0.05%). Treated logs were maintained indoors and evaluated for EAB adult emergence. Results indicated that low concentrations of borate (1% to 4%) were not effective at reducing EAB adult emergence. The highest borate concentration tested (5.5% BAE) significantly reduced EAB emergence for dip-treated logs but not for spray-treated logs. All imidacloprid concentrations, for both spray and dip treatments, completely controlled EAB adult emergence.

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