Brent, I use shiitake sawdust spawn to inoculate logs using the "spawn disc method", in which the spawn is applied to the cut ends of the logs and then wax paper and tin foil "socks" are wrapped and crinkled over and around the spawn. Then rubber bands are tightened over the foil to hold the spawn in place. I also cut slots up and down the sides of the logs, insert spawn, and cover with wax paper and then tin foil. Then I tighten more rubber bands over the spawn/paper/foil to hold everything in place. I then place the logs in big plastic bags in a closet at 60-70 degrees, I've also used a method where the inoculated logs are placed in huge cardboard boxes in an unused room, then covered with clean sawdust. With these indoor spawn methods I've had a 100% success rate without any contaminants. (Except ants! Yow..) With shiitake cultivation, outdoor spawn runs with logs are best done with dowel spawn and wax, as the wooden dowels are more resistant to weather fluctuations, sowbugs, insects and contaminant molds than the sawdust spawn.