98 INJURIOUS INSECTS OF I909 AND IQIO. 
THREE BAD INSECTS IN MINNESOTA NURSERIES 
AND ORCHARDS. 
The Oyster-shell Scale or Apple-bark Louse, the Scurfy Scale, 
and the Buffalo Tree Hopper. 
SU 
Fig. 47. The Oyster Shell Seale. After Bureau of 
Entomology, U. S. Dept. Agriculture. 
The Oyster-Shell Scale and the Scurfy Scale appear to be on 
the increase in this state, and both capable of injuring the trees of 
the nurseryman and the orchardist. 
