7 
314 REPORT OF THE DEPARTMENT OF ENTOMOLOGY OF THE 
TABLE IX.—CoNDITIONS OF SCALES ON THE BARK OF SPRAYED AND UNSPRAYED 
'TREES. 


SPRAYED TREE. UNSPRAYED TREE. SPRAYED TREE. UNsPRAYED TREE. 

Young Boole under | Young scales under | Young scales unpro- | Young scales unpro- 
k bark. 

ar tected by bark. tected by bark. 
No. No. No. No. 
6 38 1 5 
4 14 2 18 
4 40 4 10 
3 28 4 22 
4 31 3 17 
4 26 2 18 
17 32 2 28 
13 9 v4 13 
12 3 6 30 
9 17 4 6 
6 21 3 4 

On the tree with smooth bark there was, by the use of the sul- 
phur washes, a reduction of 66.6 per ct. of the young scales as 
compared with the checks protected by the paper and cotton 
bands, or a reduction of 40.1 per ct. compared with the check 
tree.. Upon the tree with rough bark the sulphur treatment 
affected a reduction of about 75.9 per ct. of the young scales. 
MISCELLANEOUS EXPERIMENTS. 
Results on scurfy bark louse.—During the work of the past two 
years opportunities have been given to note the effects of the 
sulphur washes upon this species. In several instances where 
the infestation was moderate, sugh treatment has usually checked 
the further development of the scales. When the incrustation 
has been heavy, the results attending the application of the washes 
have shown some variation in the amount of the reduction of 
the scales; but there has usually been a very appreciable destruc- 
tion of the insects. In the work this season it was impossible to 
get data upon the normal effects of these sprays upon this species 
as the increase of the young scales upon the sprayed and unsprayed 
trees was so small that there were no apparent differences between 
the trees in this respect. 
Results on dogwood scurfy bark louse-——On April 15 a num- 
ber of bushes (Cornus sp.) infested with the bark louse (Chion- 
apis corm) were sprayed with the lime-sulphur-caustie soda 
wash. Check plants and checks protected by paper and cotton 
bands were reserved as in the experiments with the oyster shell 
