Soil block test and field trial of some Chinese plantation wood species pine and poplar treated with chlorothalonil formulations and copper-based preservatives such as ACQ-B and copper citrate (CC) were conducted. The results of soil block test indicated that chlorothalonil formulations and ACQ-B as well as CC are very effective for controlling the 2 fungi species Corious versicolor and Poria placenta at different retention. There is no significant difference of weight loss among retention level range 2.54-23.1 kg/m3 of ACQ-B and CC in our test. The durability of wood treated with chlorothalonil oil formulation is better than that of treated with emulsion formulation. ACQ-B and CC treated wood at different retention level are effectively resistant to decay and termite after 36 monthr field trial at Guangzhou, south China. Leaching rate of copper of CC treated wood is much higher than that of CCA and ACQ-B treated wood by the 2 wood species Pinus massoniana and Eucalyptus urophylla according to AWPA standard M11-87.

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