322 =Report oF THE DEPARTMENT OF ENTOMOLOGY OF THR 
The conditions governing the experiment and the results attend- 
ing the use of the sulphur washes for the control of the pear psylla 
were substantially the same as those in Orchard IX. 
DISCUSSION OF RESULTS AND CONCLUSIONS. 
The experiments recorded in this bulletin represent the second 
year’s work to ascertain to what extent the sulphur washes may 
be used in place of the bordeaux-arsenical mixtures for orchard 
treatment. In the investigations undertaken the utility of the 
washes has better been shown with the peaches than with other 
varieties of fruit; for when infestation with scale exists, one 
thorough spraying during the dormant season will control both 
scale and leaf curl, thus dispensing with the usual spraying with 
bordeaux mixture for the prevention of this disease. To ascer- 
tain if a similar or equally important substitution may be made 
for the spraying of other kinds of fruit has been the chief aim 
of the experiments discussed in detail in this bulletin. Owing 
to the absence of brown rot and pear scab no data have been 
obtained as to the value of the sulphur sprays for these diseases. 
In the work with pears one application of a sulphur wash proved 
an efficient remedy for the pear blister mite. In the experiments 
upon the apple, definite results have been secured, showing the 
value of sulphur sprays for apple scab. Upon the checks there 
was an average of 83.1 per ct. scabby fruit as compared with 
61.0 per ct. scabby fruit from the trees treated with the sulphur 
wash alone, making a difference of 22 per ct. less scabby fruit 
for the sulphur-treated trees. The trees sprayed with a sulphur 
wash and with the two later applications of the bordeaux-arseni- 
cal mixture had 9.9 per ct. scabby fruit and 11.6 per ct. wormy 
fruit which correspoud very closely with the results obtained 
with the three applications of the bordeaux-arsenical “mixture 
upon these two pests. 
By supplementing one application of a sulphur wash during 
the dormant season with the two later treatments of the bor- 
deaux-arsenical mixture there was, in comparison with the trees 
sprayed with the sulphur wash, a reduction of 51.1 per et. 
scabby fruit and 30.7 per ct. wormy fruit. From these results 
it seems evident that a plan of spraying well adapted for the 
