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This study investigated the efficacy of Rotstop^®, a native Latvian <i>Phlebiopsis gigantea</i> strain and 35% urea solution in combination with a stump cover treatment to control against natural spore infection by <i>Heterobasidion</i> spp. upon precommercial thinning of Norway spruce in three stands growing on former agricultural lands. The major findings were that (i) infection rates of <i>Heterobasidion</i> spp. on stumps treated with the native <i>P. gigantea</i> strain, Rotstop^® or urea are similar when stumps are uncovered, and (ii) stump cover promotes stump colonization by the Latvian <i>P. gigantea</i> strain and Rotstop^®, leading to a significantly smaller relative area colonized by <i>Heterobasidion</i> spp., as well greater efficiency against <i>Heterobasidion</i> in comparison with urea. Covering of stumps appears beneficial for controlling Heterobasidion stump colonization and may be valuable to forest owners if used in small-scale operations, but it is impractical in automatized thinnings, where managers should consider using regular Rotstop^® without covering the stumps.