The effectiveness of CCA and ACA in treated aspen mini stakes tested using a novel bag procedure, with unsterile soil fortified with Chaetomium globosum and Ceratocystis albida, is reported. Good agreement between toxic limits determined using the standard weight loss procedure, and those determined by the strength technique were found, with some indication that the strength loss method is more sensitive. The investigation also showed that the toxic limits for CCA (4.0-8.0 kg/m³) were twice those of ACA (2.0-4.0 kg/m³). In addition, based upon the strength loss, a CCA retention greater than 8.1 kg/m³ was required to prevent decay by Ceratocystis albida in this laboratory screening method.

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