The Sept 2004 issue of the NNGA Nutshell included an article from Dr. Charles Spurgeon, the NNGA Butternut Inventory Committee Chairman.
In it he summarized some of his experiences of 25 years with grafted butternut, buartnut, and heartnut(all on eastern BW rootstock) in his grove, which has a 'well-developed and well-nourished naturally-occurring strain of the Sirococcus fungus'.
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