838 Report oF THE DEPARTMENT OF ENTOMOLOGY OF THE 
a few of the small twigs that were not well sprayed. Nos. 3 
and 4 were not affected as much as the other two trees; al- 
though in both cases the leaves dropped prematurely. The 
result upon the scales was also the same. , 
These experiments therefore indicate that only a compara- 
tively small amount of sulphur and lime in proportion to the 
water is needed to kill the scale but that even when much 
reduced in quantity it cannot safely be used upon the foliage. 
SECOND SERIES. 
The second series was made in September, the trees being 
sprayed from September 3 to 5. Eight Japan plum trees and 
three peach trees, badly encrusted with the scale, were used for 
these experiments. The weather was clear with a light wind 
except on the second morning when there was a light shower. 
In these experiments six plum trees and three peach trees 
were sprayed with mixtures in which the sulphur was reduced 
to a minimum as shown in the formula below. The remaining 
two plum trees were sprayed with whitewash only. This ar- 
rangement was for the purpose of making parallel tests with 
the lime and sulphur to determine as far as possible to what 
extent the sulphur can be reduced and still kill the scale and 
also whether there will be any appreciable effect on the scale 
if the sulphur is omitted entirely. The experiments in detail 
are as follows: ‘ ! 
Trees 1, 2 and 3 were sprayed with a mixture made after the 
following formula: | 
Dame, ainslaked osc, © haan cee 10 pounds. 
Sulphur, crown Fs AO aes Se es 1 pound. 
Water w c iets xt dete ne oa eee ak ee 45 gallons. 
Trees 4, 5 and 6 were sprayed with a similar mixture except 
that 15 pounds of lime was used. 
Trees 7, 8 and 9 were sprayed with the same mixture as 
numbers 1 to 3 except that copper sulphate at the rate of one 
pound to each 11 gallons of the mixture was added. | 
Tree 10 was sprayed with whitewash made of 10 pounds of 
lime to 45 gallons of water and tree 11 with whitewash in which 
15 pounds of lime to 45 gallons of water was used. 

