Field Trials with Captafol–An Acceptable Antisapstain Chemical

Field trials with Pinus radiata sawn timber have shown that captafol (cis-N- ((1,1,2,2-tetrachloroethyl) thin) -4-cyclohexene 1,2-dicarboximide) is an acceptable alternative to 0.5 percent sodium pentachlorophenate plus 1.5 percent borax. Sawn timber dipped in 0.2 percent a.i. captafol and stored in block stack for 3-4 months had 84-100 percent of pieces remaining free from sapstain compared with 52-87 percent for timber dipped in sodium pentachlorophenate and stored for the same length of time. When applied by spray 0.3 percent a.i. captafol gave control of sapstain similar to that of sodium pentachlorophenate. Both chemicals were equally effective in preventing the establishment of decay fungi. Although captafol is a water-insoluble product, there were no problems of sedimentation in the dip tanks.

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