CONTROL QF THE GRAPE-BERRY MOTH. 
25 
EXPERIMENT IX THE MOORHEAD VINEYARD, MOORHEADVILLE, PA., 1916. 
An experimental plat of 48 rows, 8 rows per acre, was chosen in 
this vineyard. It was divided into 6 plats of 8 rows each. During 
the season of 1915 the infestation was heavy, 30 to 35 per cent of the 
berries being " wormy/' with a tendency for heaviest infestation at 
the west side. Accordingly a transverse check of seven unsprayed 
vines at the end of each row was left. The arrangement of plats is 
shown by the diagram (fig. 8). 
Table 16. — Spray mixture used and methods and dates of application, Moorhead vine- 
yard, Moorheadville, Pa\ °§ 16. 
Date 
sprayed. 
Arsenate 
of lead 
(pow- 
der.) 
Bordeaux mixture. 
Laundry 
soap. 
Potash 
fish-oil 
soap. 
Soft 
soap. 
Water. 
Method 
Plat No. 
Lime. 
Copper 
sulphate. 
of appli- 
ation. 
I 
July 8, 19 
...do.... 
Pounds. 
2% 
If 
n 
Pounds. 
3 
3 
3 
3 
3 
3 
Pounds. 
3 
3 
3 
3 
3 
3 
Pounds. 
1 
1 
Pounds. 
Pounds. 
Gallons. 
50 
50 
50 
50 
50 
50 
Trail- 
II 
j 
ers." 
Do. 
Ill 
July 8,20 
...do 
2 
Do. 
IV 
1 
"Setnoz- 
V 
...do 
1 
z 1 e s" 
first 
appli- 
cation ; 
"trail- 
e r s" 
second. 
"Trail- 
VI. . 
July 20. 
1 
ers." 
Do. 
! 
Table 17. — Percentage of infestation in experimental plats, Moorhead vineyard, Moor- 
headville, Pa., 1916. 
Number 
of 
vines. 
Number 
of 
clusters. 
Total 
berries. 
First brood. 
Second brood. 
Plat No. 
Infested 
berries. 
Infesta- 
tion. 
Infested 
berries. 
Infesta- 
tion. 
I 
20 
6 
20 
6 
20 
6 
20 
6 
20 
6 
20 
6 
850 
253 
675 
226 
709 
195 
638 
235 
703 
224 
709 
154 
29,750 
9,108 
23,625 
8,136 
23,397 
7,410 
19, 778 
8,930 
23,902 
8,064 
20,561 
4,312 
243 
406 
154 
297 
152 
340 
163 
345 
190 
174 
333 
86 
Percent. 
0.81 
4.45 
.65 
3.65 
.64 
4.57 
.82 
3.86 
.79 
2.15 
1.61 
1.99 
1,752 
3,812 
949 
2,997 
806 
2,848 
1,307 
2,443 
4,605 
2,741 
1,079 
1,010 
Per cent. 
5.88 
Check I 
41.85 
n 
4.02 
Check II 
36.83 
Ill 
3.15 
Check III 
38.43 
TV 
6.61 
Check IV 
27.33 
V 
19.60 
Check V 
33.99 
VI 
5.25 
Check VI 
23.39 
The final counts showed satisfactory results in plats where two 
applications with "trailers" were made with poison and laundry 
or fish-oil soaps (Plats I, II, III). Fish-oil soap without resin as 
well as laundry soap was an effective adhesive, fish-oil soap having the 
advantage. A "soft soap" was also used (Plat V), but proved a 
