216 
THE PLUM CUBCULIO. 
In Bulletin 9 of the Iowa Agricultural Experiment Station, page 
383 (1890), Prof. Gillette gives results of experiments on plums with 
London purple on the plum curculio and plum gouger. The poison 
was applied with a hand pump to 23 trees at the rate of 1 pound to 
120 gallons May 4 and 11. The leaves were badly burned. After 
May 25 all drop fruit on 5 trees each of the sprayed and unsprayed 
blocks was examined. A total of 21,000 plums was examined, and a 
benefit was determined of 1.1 per cent in favor of spraying. 
SOME RESULTS OF SPRAYING PLUMS. 
At Fort Valley, Ga., during 1905 Mr. Beattie carried out some spray- 
ing tests on Japanese plums. The plats were, however, small and 
there was considerable overflow from the surrounding unsprayed 
trees. Plats were laid off, extending across three varieties, namely, 
Wickson, Ked June, and Satsuma, in which order the varieties are 
given in the table. The entire crop throughout the season from 
three trees of each variety was counted with the exception of Plat I, 
where only 2 trees were used. Plats received from 1 to 3 applications 
of arsenate of lead in water, without addition of lime. According to 
Mr. Beattie's notes practically no injury resulted to the foliage from 
the sprays. The results are given in Table CVI. 
Table CVI. — Results of spraying Japan plums for the plum curculio, Fort Valley, Ga., 
1905. 
Treatment. 
6 
Eh 
Fruit from 
ground. 
Fruit from tree. 
3 
ft 
'3 2 
£ jj 
o 
Eh 
-d 
ai 
in 
!s 
'3 
o 
Eh 
u 
i> 
— , a 
■4-» W 
o 
&H 
3 
C3 
O 
fl+3 
o 3 
O) <t-i 
»T3 
a> a 
a o 
r 
Plat 
No. 
Cl 
o 
3 
Ph 
T3 
a> 
w 
a 
o 
"3 
o 
Eh 
3 
o 
a 
Ph 
a 
"3 
-d 
B 
o 
CO 
"3 
o 
Eh 
60 3 
8 ±3 
o 3 
I 
One application, ar- 
senate of lead, 2 
pounds to 50 gal- 
lons water, Mar. 19. 
Two applications ar- 
senate of lead, 2 
pounds to 50 gal- 
lons water, Mar. 19 
and Apr. 20. 
Three applications 
arsenate of lead, 2 
pounds to 50 gal- 
lons water, Apr. 4 
and 20, May 4. 
1 
f 2 
3 
1 
r 2 
3 
li 
52 
236 
44 
213 
2 
114 
54 
350 
152 
60 
37 
4 
26 
300 
178 
360 
204 
296 
81 
217 
28 
414 
232 
710 
288 
257 
116 
404 
212 
41 
326 
538 
500 
298 
442 
942 
46.92 
39.41 
II.... 
255 
372 
210 
211 
345 
172 
71 
38 
32 
326 
410 
242 
430 
31 
73 
28 
11 
15 
527 
35 
200 
957 
66 
273 
685 
403 
283 
239 
356 
187 
598 
73 
232 
1,283 
476 
515 
837 
728 
141 
978 
534 
54 
762 
1,296 
1,371 
782 
903 
2,274 
39.70 
41.20 
III... 
88 
153 
108 
69 
138 
92 
72 
65 
53 
160 
218 
161 
90 
90 
72 
25 
30 
8 
270 
194 
313 
360 
284 
385 
178 
243 
180 
94 
168 
100 
342 
259 
366 
520 
502 
546 
349 
299 
190 
539 
252 
63 
777 
1,029 
601 
362 
967 
1,568 
61.67 
24.48 
68 
105 
72 
45 
87 
58 
31 
30 
10 
99 
135 
82 
40 
105 
118 
9 
17 
36 
35 
91 
6 
75 
196 
124 
108 
210 
190 
54 
104 
94 
66 
121 
16 
174 
331 
206 
IV... 

245 
190 
71 
316 
263 
62 
132 
395 
508 
252 
203 
711 
28.55 
66.58 
