SPRAYING FOR CURCULTO ON APPLE. 
195 
EXPERIMENTS INT WESTERN NEW YORK AND NORTHWESTERN PENNSYLVANIA. 
Results of demonstration spraying for apple insects and diseases 
in western New York (Westfield) and northwestern Pennsylvania 
(North East) as bearing on the control of the curculio are given in 
Table XCVI. In the Westfield work the average percentage of apples 
uninjured by the curculio from the 5 sprayed Baldwin trees used 
for counts was 91.07, as against 76.21 on the 5 unsprayed count 
trees, the average number of punctures per fruit for the former 
being 0.08 and for the latter 0.237. 
In the case of Duchess trees at North East, Pa., notably better 
results are shown, which may in part be due to the earlier picking 
of the fruit of this variety, as avoiding late feeding punctures by the 
beetles. The 3 count trees of the sprayed block showed 79.04 per 
cent sound fruit, as against 25.44 from the 3 unsprayed count trees, 
a difference, in favor of two applications of poison, of 53.60 per cent 
of the crop. (See PI. XV). 
Table XCVI. — Results of spraying apples for the plum curculio. 
WESTFIELD, N. Y., 1908. 
NORTH EAST, PA., 1906. 
Plat 
No. 
Treatment. 
Variety. 
Tree 
No. 
Total 
number 
of apples 
Total 
number 
of apples 
punc- 
tured. 
Percent- 
age of 
sound 
apples. 
Average 
percent- 
age of 
sound 
apples. 
("Four applications Bordeaux mix- 
1 ture (4-4-50) plus 2 pounds 
1 arsenate of lead: May 0, May 
( 27, June 8, June 27. 
Unsprayed 
[■Baldwin 
do 
1 ' 
i 3 
I I 
f 1 
2 
1 3 
4 
1 5 
1,658 
2,356 
3,380 
1,204 
2,829 
74 
244 
240 
156 
207 
95.53 
89. 04 
92.90 
87.00 
92.60 
I 
11,427 
921 
91.07 
748 
1,518 
802 
1,100 
838 
191 
309 
1S1 
212 
312 
74.40 
79. 60 
79.00 
80. 80 
62. 77 
II.... 
5,066 
1,205 
76. 21 
[Two applications Bordeaux mix- 
j ture (4-4-50) plus 2 pounds 
I arsenate of lead: May 24, June 7. 
i insprayed 
1 Duchess Old- 
f en berg. 
(1 
II 
P02 
541 
370 
156 
154 
49 
80.54 
71 55 
B 
I 
1.713 | 359 
79.04 
647 
L46 
473 
223 
95 
20. S9 
16 7" 
11.... 
1,061 791 
25.44 
