I would like to grow mushrooms on oak trees I can harvest from my property. I've read that the best results will be when the sap is rising but the tree hasn't budded yet. The mycelium feeds on the sugars in the logs.
I would love to be able to measure the sugar content so I could accurately asses the sugar content. Here in Southern Oregon the winters are mild and the leafing out of the oaks varies quite a bit from year to year.
How can I measure sugar content of the sap in a tree?