CONTROL OF THE GRAPE-BERRY MOTH. 
17 
s 
IT 
£7 
& 
1VfS7- 
been employed. Tables 6 and 7 will give in detail the treatments 
applied in the different vineyards and the results as shown by per- 
centages of "wormy" fruit. 
EXPERIMENT IN THE BARTLETT VINE- 
YARD, NORTH EAST, PA., 1915. 
Experimental work in this 
vineyard was conducted in a 
square corner section of about 
2 acres which had been very 
heavily infested in 1914. It 
was divided into two large 
plats of 1 1 rows each with an 
8-row check between and 2 
narrow plats of 3 rows each 
outside of the larger ones. 
&4ST 
SOCSTf? 
Fig. 3.— Diagram showing arrangement of experimental 
plats in the vineyard of Mr. A. P. Bartlett, North East, 
Pa., 1915. The sprayed plats are marked "with Roman 
numerals and the check plats with letters. (Original.) 
The adjacent vineyard also was unsprayed and used as a check, 
arrangement of plats is shown in the diagram (fig. 3). 
The 
Table 6. — Spray mixtures used and method and dates of application in experimental 
plats, Bartlett vineyard, North East, Pa., 1915. 
Dates of 
spraying. 
Arsenate 
Bordeaux mixture. 
Laundry 
soap. 
Nicotine 
sulphate. 1 
Method 
Water. ; of appli- 
cation. 
Plat No. 
of lead 
(paste). 
Lime. 
Copper 
sulphate. 
Remarks. 
I 
II 
July 6,19 
...do 
Pounds. 
3 
3 
5 
5 
Pounds. 
3 
3 
3 
3 
Pounds. 
3 
3 
3 
3 
Pounds. 
1 
1 
1 
1 
Pints. 
i 
i 
i 
I 
Gallons. 
50 Trailers . 
50 ...do 
50 ...do 
50 ...do.... 
Double 
sprayed. * 
Single 
Ill 
...do 
sprayed. 2 
Single 
rv 
...do 
sprayed. 2 
Double 
sprayed. 2 
i Last application only. 
* Plats marked "double sprayed" were sprayed twice on each date of treatment, the second spray being 
applied as soon as the first had dried. 
Table 7. — Percentage of infestation in experimental plats, Bartlett vineyard, North East, 
Pa., 1915. 
Plat No. 
First brood. 
Num- 
ber of 
vines. 
Num- 
ber of 
clus- 
ters. 
Total 
berries. 
Infested 
berries. 
Infes- 
tation. 
Second brood. 
Num- 
ber of 
vines. 
Num- 
ber of 
clus- 
ters. 
Total 
Infested 
berries. 
berries. 
21,760 
849 
23,489 
963 
22, 926 
3,372 
29,066 
313 
30,830 
68 
22,175 
3,925 
16,016 
1,399 
Infes- 
tation. 
I 
n 
Check A 
III 
rv 
Check B 
Chock C. 
1,024 
1,132 
1,124 
1,330 
1,192 
1,051 
832 
31,314 
30,568 
38, 676 
41,107 
29, 567 
21,356 
572 
572 
2,404 
375 
124 
1,943 
1,743 
Per 
cent. 
1.97 
2.71 
6.57 
8.16 
76S 
849 
843 
624 
Per cent. 
3.9 
4.1 
14.8 
1.2 
.23 
17.7 
46.2 
r069°— Bull. 550—17- 
