Bill Tindall, E.Tn.
The wood is drying at a rate of 5% a day, shower than I thought it would for 90 degree days. The surface is staying dry, by experienced feel about 10-15% moisture content, way to low for mold to propagate. Remains to be seen if inside turns grey from "chemical staining".
When a friend cut holly in the spring it molded through in 24 hours. Sap had a high sugar content at that time. My tree was starting dormancy and the sugars have turned to starch for winter storage. To my surprise the slabs that are in a location where they are not drying much have not molded. So, time of year may be the most critical factor.