Thirty-one miscellaneous formulations have been screened using a filter paper assay technique, for their efficacy in controlling the growth of Chaetomium globosum, Cephalosporium acremonium, and a mixed inoculum of finely ground soft-rotted wood obtained from preservative treated transmission poles. The formulations consisted of various organic compounds and inorganic preparations made from different salts of the active elements copper, fluorine, boron and arsenic. The most effective toxicants were P. C. M. C., Busan 52, Busan 30, Difolatan, Spergon, and a Cu-F-B formulation. The toxicants with most potential for controlling soft rot in the standing pole, i. e., those which have known diffusing ability when applied as remedial in situ treatments, include Cu-F-B formulation no. 19, cupric proprionate, Cu-F-B formulation no. 15, ammonium bifluoride + arsenic pentoxide (no. 4) and a third Cu-F-B formulation (no. 18). Discussion of synergistic effects of admixtures of active ingredients is presented.

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