From the first surface truffles appearing end of February 2016, it has been a continual process inspecting & protecting them with additional soil cover. With more truffle eruptions each week, this will continue until season starts, but will soon slow as the tree’s shut down for winter. Without protection, over 80% of the surface truffles would not survive until harvest time. A portion are forming at reasonable depths, but can still become exposed to damage through soil cracks.
Six weeks worth, 7.5kg (in bags) of spoiled truffle has been removed so far, which surprisingly is a cause for celebration! It’s a bit less than last year, with more than double the truffles located, so a significant reduction in spoilage… so far. From past experience, about the same amount can be expected to spoil between now and the end of the season.
Causes will vary widely from damage by fungi, insects and animals. Frost and heat damage can also occur, and they can even be squeezed by tree roots, or suffocate depending on soil structure and rainfall.