Methods for Evaluating Fungal Inhibition and Barrier Action of Tree Wound Paints. H. L. Dooley, Supervisory Plant Pathologist, Environmental Protection Agency, BFSD, Northwest Biological Investigation Station, Corvallis, OR 97330. Plant Dis. 64:465-468. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1980. DOI: 10.1094/PD-64-465.

Six commercial asphalt tree wound paints were evaluated in vitro for fungal inhibition and mechanical barrier action to Lenzites trabea, Stereum frustulatum, Poria placenta, and Coriolus versicolor. The paints alone were not fungitoxic and did not provide a mechanical barrier. Paints containing 3.3 and 10% copper naphthenate were inhibitory and provided an inhibitive barrier against the fungi. The test methods may be valuable for evaluating potential tree wound paints.