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1. The distribution of Silver-leaf disease is described.2. Inoculations of branches of Plum trees with sporophores of Stereum purpureum have almost invariably resulted in silvering.3. The mycelium of Stereum purpureum has been cultivated in pure culture from spores and inoculations with this mycelium have caused silvering.4. A small number of inoculations with the spores of Stereum purpureum have resulted in silvering.5. Various series of control experiments have given negative results.6. The investigations strengthen the view that Stereum purpureum is the active agent which causes Silver-leaf disease in this country.

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