REPORT OF THE DEPARTMENT OF 
ENTOMOLOGY. 
; 
SULPHUR WASHES FOR ORCHARD TREATMENT, II.* 
P. J. Parrott, S. A. Beacu Anp F. A. SIRRINE. 
SUMMARY. 
This bulletin contains the results of the second year’s experi- 
ments to determine to what extent sulphur washes may be used 
in the place of bordeaux-arsenical mixtures for orchard treat 
ment. 
One application of a sulphur wash to apple trees reduced the 
scab by 22 per ct. A combined treatment, consisting of one ap- 
plication of a sulphur wash before blossoming and two applica- 
tions of a bordeaux-arsenical mixture after blossoming reduced 
the scab 73.7 per ct., and wormy apples (codling moth injury) 
27.1 per ct., which are practically identical with the results ob- 
tained by the usual three applications of the bordeaux-arsenical 
mixture for the control of these two pests. 
In the experiments with pear trees an application of a sulphur 
wash before blossoming proved an efficient remedy for the pear 
blister mite (Phytoptus pyri Scheuten). Owing to the absence 
of pear scab in the orchards under observation no results were 
obtained as to the value of this treatment for this disease. For 
the same reason there were no data as to the effects of an early 
application of a sulphur wash upon brown rot. 
The comparative tests of arsenite of soda and arsenate of lead 
for the treatment of the plum curculio gave inconclusive data, 
as this inseet did no apprciable amount of injury. In the experi- 
ments with the codling month there was an average of 8.6 per ct. 
* A reprint of Bulletin No. 262. 
