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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 17 
pounds. Both leads were handled from the ground. The spraying 
was done from only one side of the row, each operator encircling the 
trees in his row as the outfit moved across the orchard. The spray 
materials were mixed by the senior author and the applications made by 
the regular orchard force under his supervision. 
When the peaches were picked, they were graded and the results 
tabulated by varieties. As in the case of apples, the variety variations 
were so slight that the results have been combined in Table 3. 
It will be noted by reference to Table 3 that the results are in complete 
accord with those secured in the tests on apples. Again, in no case 
does the difference in the average amount of injury in the several plots 
which received or failed to receive the spreader, exceed one percent. 
Furthermore, these results parallel exactly those reported for peaches 
in 1922. 
Table 3. Results of Tests with Casein Spreader on Peaches, Carman and 
Belle Varieties, Leesburg, Virginia, 1923 
Plot 1 
Plot 2 
Plot 3 
Plot 4 
41,079 Peaches 
66,938 Peaches 89,460 Peaches 
52,285 Peaches 
Regular 
* 
Regular 
Regular 
Treatment 
Type of Injury 
Regular 
Treatment 
Treatment 
With Nicotine 
Treatment 
with Casein 
with Nicotine 
Sulphate 40% 
No Spreader 
Spreader 
Sulphate 40% 
and Casein 
Spreader 
No. % 
No. % 
No. . % 
No. % 
Curculio. 
. 3974 9.674 
6347 9.481 
9432 10.543 
4683 8.956 
Brown Rot. 
29 .070 
37 .055 
75 .083 
36 .068 
Scab. 
143 .348 
159 .237 
380 .424 
216 .413 
Spray Burn.... 
. 2024 4.927 
1221 1.824 
1444 1.614 
934 1.786 
Plot Averages. . 
3.755 
2.899 
3.166 
2.806 
Mr. F. A. Fenton: I would like to ask if chemical tests were made 
of the leaves sprayed with casein to determine the amount of arsenic 
or lead oxide present. 
Mr. L. A. Stearns: No such tests were made. 
Mr. F. A. Fenton: This year in Iowa we have been conducting some 
experiments for controlling the apple maggot. One hundred leaves 
were picked from one hundred different trees that had been treated 
with casein and we found twice as much lead oxide after a period of IS 
days on fruit that had been sprayed with casein than on fruit where 
casein had not been used. 
