EXPERIMENTS FOR CONTROL. 
25 
however, an effective, convenient, and nonoffensive spray, and the 
cheapest one that has been successfully used against the red spider. 
LYE-SULPHUR. 
The lye-sulphur solution (Formula No. 1), used with success against 
the red spider on the almond by Mr. W. H. Volck, was applied with 
flour paste and with cresol soap in various proportions. The results 
of these experiments (Table VI) were obtained from tag counts and 
are very promising. 
The lye-sulphur solution, used with either the cresol soap or the 
flour paste, was very effective, and when used in the proper propor- 
tions did not injure the foliage in the least. It would have been 
used more extensively in field experiments had not the lye been 
disagreeable to handle in making up the stock solution. The lime- 
sulphur on the market at a relatively low figure proved just as 
effective as the lye-sulphur and, being much more convenient, was 
preferred. 
Table VI. — Spraying experiments with lye-sulphur in various combinations against the 
red spicier on hops. 
No. 
Date. 
Material. 
Applica- 
tion. 
Num- 
ber of 
mites 
present. 
Num- 
ber of 
mites 
killed. 
Per 
cent of 
mites 
killed. 
Cost per 
100 
gallons. 
Effect on vine. 
1 
2 
3 
4 
June 23 
June 26 
July 2 
July 15 
...do 
Lye-sulphur, 4-100; cresol 
soap, 1-300. 
Lye-sulphur, 2-100; sul- 
phur, 15 pounds to 100 
gallons; flour paste, 4-100. 
Lye-sulphur, 1-100; sul- 
phur, 15 pounds to 100 
gallons; flour paste, 4-100. 
Lye-sulphur, 1-100 
Lye-sulphur, 2-100 
Thorough. 
...do 
...do 
...do 
...do... 
377 
374 
371 
518 
437 
367 
366 
361 
458 
384 
97.4 
97.8 
97.4 
88.5 
87.8 
$1.05 
.708 
.55 
.15 
.31 
Slight injury. 
No injury. 
Do. 
Do. 
Do. 
Although the lime-sulphur, or lye-sulphur, and flour-paste solution 
did not injure the foliage or the blossoms of the hop vines, it did 
injure the more tender hop cones. The late spraying with lime- 
sulphur, if practiced, should be completed before the hop cones come 
out from the burr. 
NICOTINE SOLUTIONS AND OTHER MATERIALS. 
The nicotine solutions, used with the Lima-sulphur, or with soap, 
or alone, were quite expensive, as may be seen in Table VII. The 
lime-sulphur and flour paste was so much cheaper and so effective 
that the nicotine experiments which had been outlined were conducted 
on a small scale only. The results of these experiments, together with 
the results of some miscellaneous experiments, are given in Table VII. 
