20 BULLETIN 550, U. S. DEPARTMENT OF AGRICULTURE. 
EXPERIMENT IX THE MOORHEAD VINEYARD, MOORHEADVILLE, PA., 1915. 
The experimental work in the Moorhead vineyard was conducted 
in the same section as in 1914, but the arrangement of plats was 
somewhat changed. The plat 
that had the lightest infestation 
was chosen as check, while the 
check of the 1914 season was 
sprayed. The adjacent sections 
of the vineyard were sprayed once 
by the owner, soon after July 1, 
with arsenate of lead (paste), 3 
pounds, and Bordeaux mixture, 
50 gallons, to control the grape 
rootworm; the spray was applied 
with " set nozzles." Counts were 
made from these sections adjacent 
to the experimental block and they are recorded as checks, B and C. 
The arrangement of plats is shown by the diagram (fig. 5). 
Table 10. — Spray mixtures used and methods and dates of application in experimental 
plats, Moorhead vineyard, Moorheadville, Pa., 1915. 
B 
s/o.*?; 
yy 
7 
27 
IZ7 
/4 
2ir 
tvfsr 
C/V^C/T ^^72f 
c 
£>isr 
SOC/77y 
Pig. 5.— Diagram showing arrangement of plats in 
the vineyard of Mr. J. M. Moorhead, Moorhead- 
ville, Pa., 1915. The sprayed plats are marked 
with Roman numerals and the check plats with 
letters. (Original.) 
Dates of 
spraying. 
Arsenate 
of lead 
(paste). 
Bordeaux mixture. 
Laundry 
soap. 
Nicotine 
sulphate. 
Plat No. 
Lime. 
Copper 
sulphate. 
Uater " plication. 
I 
July 1,20.. 
July 1,20.. 
July 1,20.. 
July 1,21.. 
Pounds. 
3 
5 
3 
3 
Pounds. 
3 
3 
3 
3 
Pounds. 
3 
3 
3 
3 
Pounds. 
1 
1 
1 
1 
Pints. 
Gallons. ■ 
II 
50 
50 
50 
er") driven in 
alternate al- 
leys. 
Every alley. 
III. . . . 
i 
IV... 
leys. 
Every alley. 
Table 11. — Percentage of infestation in experimental plats, Moorhead vineyard, Moore- 
headville, Pa., 1915. 
Number 
of vines. 
Number 
of 
clusters. 
Total ber- 
ries. 
First brood. 
Second brood. 
Plat No. 
Infested 
berries. 
Infesta- 
tion. 
Infested 
berries. 
Infesta- 
tion. 
I 
20 
820 
975 
726 
975 
813 
785 
756 
29, 130 
34, 450 
22,411 
25,512 
26,350 
21,951 
22,478 
90 
112 
49 
903 
141 
715 
822 
Per cent. 
0.31 
.32 
.22 
3.54 
.54 
3.25 
3.65 
1,099 
717 
943 
4,860 
1,070 
4,997 
7,736 
Per cent. 
3 77 
II 
Ill : 
Check A 
20 
20 
20 
20 
20 
20 
2.08 
4.21 
19 05 
IV 
Check B 
4.06 
22.81 
Check C . . . 
34 86 
• 
