10 
BULLETIN 1428, U. S. DEPARTMENT OF AGRICULTURE 
Figures T, B, and 8, A, longitudinal and cross sections of a 3 by 3 
inch oak timber honeycombed by cadelle larvae. Individual larval 
Fig. 7. — Cadelle burrows in wood : A, Quarter-inch strip of soft wood riddled by 
larvae taken from bran bin of flour mill ; B, longitudinal section of 3-inch oak 
timber used as rafter in roof of 100-year-old wheat granary on Maryland farm 
(for cross section see fig. 8, A) 
channels may be as long as 2^ inches. One-inch boards of pine are 
easily perforated. Figure 6, A, shows the excavations made in a 
hardwood board used as top to a flour elevator in a mill. In one 
