June, 1955 
gus. In winter months, Glischrochilus 
obtusus was present usually only in small 
numbers of | to 10 per mat. 
In April, large numbers of adult Scoly- 
tidae were seen running over the bark sur- 
face or making holes through the bark of 
diseased oaks that were near the mat-pro- 
Curt: Oak Witt INocuLA 
309 
ducing stage. Later, in May and June, 
many holes made by these beetles were 
seen in the wood and bark of most of the 
mat-bearing trees. It was common to find 
several holes extending through mycelial 
mats beneath the bark, fig. 16B, C. Many 
of these holes had been made directly 
Fig. 18—Mats of Endoconidiophora fagacearum on which unidentified fungi have overrun 
all but the central pads. 
