Insufficient drying of white poles in Sweden causes inadequate penetration of the impregnation compounds, CCA salts and creosote, in a varying proportion of the treated poles, and with pretreatment decay present, sooner or later, internal fungal attack in the ground-line zone of the standing poles is the result. The application of a diffusing fungicide in the ground-line zone in connection with the erection of poles would protect the "pockets" of untreated sapwood and thereby create a more uniform performance, delaying the necessity of early inspection and eliminating a considerable number of premature interchangements of poles.

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