Experimental study for increasing productivity of Boletus edulis s.l. in Italy.

A drastic decrease in the presence and productivity of many fungal species, especially symbionts, has been recorded in various parts of Europe. Many of the most famous edible species, such as the group of Boletus edulis s.l., are in this category. The present study proposes to clarify the ecological requirements of these species (B. edulis s.l.), in order to provide guidelines for environmental management aimed at conserving the ideal habitat of this culinary delicacy. The presence of B. edulis in two age classes (30 and 60 years) of fir woods and data on the effects of various management treatments (thinning and litter removal) on the fruiting process are reported. B. edulis is replaced by Boletus badius in older stands. Medium thinning seems to have a positive effect whereas removal of the litter layer has a negative effect on the fruiting process of B. edulis.