High frequency sound devices lack efficacy in repelling birds.
Erickson, W.A., R.E. Marsh and T.P. Salmon. 1992. High frequency sound devices lack efficacy in repelling birds. Proceedings of the Vertebrate Pest Conference 15:103-104.
Erickson, W.A., R.E. Marsh and T.P. Salmon. 1992. High frequency sound devices lack efficacy in repelling birds. Proceedings of the Vertebrate Pest Conference 15:103-104.
