Effectiveness of a Lentrek? and Polyphase? preservative treatment in Douglas-fir determined by a soil-block analysis

A soil-block test was employed to determine the threshold value for a combined commercial treatment containing Lentrek? insecticide (chlorpyrifos) and Polyphase? fungicide (3-iodo-2 propynyl butyl carbamate). A threshold value was determined for the combined system corresponding to a Polyphase retention of 0.0074 pcf (211 ppm) for Poria placenta and 0.0065 pcf (186 ppm) for Gloeophyllum trabeum. The latter figure may not be valid because of an unusually slow decay rate of this test fungus. These results suggest that this treatment is effective against decay fungi at very low retention levels.

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