CONTROL. OF GRAPE-BERRY MOTH. U 
conditions in September and October retarded the development of 
second-brood larvae and counteracted the previous favorable condi- 
tions. 
The season of 1918 opened unusually early and continued favor- 
able for all growth processes throughout the season. Spraying was 
but little interfered with and no unusual weather conditions pre- 
vailed that affected the spraying results. 
SPRAYING EXPERIMENTS IN 1916. 
Table I. — Vineyards used for spraying experiments in northern Ohio, 1916. 
Vine- 
yard 
Vineyard owner and 
location. 
Varieties. 
Dates of spray appncations. 
Esti- 
mated 
infes- 
tation 
1915. 
Gallons of spray ma- 
terial per acre. 
No. 
First. 
Second. 
Third. 
First. 
Second. 
Third. 
1 
2 
3 
4 
5 
G 
Roland Brown, Kelleys 
Island. 
0. W. Brown, Kelleys 
Island. 
Charles Duggan, Put- 
in-Bay. 
W. R. Huntington, Put- 
in-Bay. 
E . Manty , Venice 
John Schonhart, Venice . 
Catawbas . 
....do 
....do 
Catawbas, 
Concords. 
....do 
....do 
July 5 
July 3 
June 30 
July 1 
June 29 
June 27, 
28. 
July 21 
July 20 
July 17 
July 19 
July 12 
July 11, 
12. 
Aug. 9 
....do... 
Aug. 7 
Aug. 8 
Aug. 3 
Aug. 2 
Perct. 
70 
85 
75 
80 
90 
70 
173 
120 
112 
105 
128 
90 
192 
202 
176 
160 
304 
236 
192 
200 
112 
112 
150 
230 
Experiments were conducted in six vineyards in the Sandusky 
and island sections, as shown in Table I. In all of these experiments 
the arsenicals were applied in Bordeaux either 3-3-50 or 2-3-50 
strength. Laundry soap at the rate of 2 pounds to 50 gallons was 
used for the first spray application in all of the vineyards and for 
the second spray in vineyards Nos. 5 and 6. It became apparent dur- 
ing the second spray application that resin fish-oil soap possessed 
better spreading qualities than laundry soap and so it was used in 
all the other spray applications at the rate of 1 pound to 50 gallons. 
Previous to bloom all of the vineyards received an application of 
Bordeaux alone for the control of downy mildew. The strength of 
arsenicals in the berry-moth sprays was varied in the different vine- 
yards as shown in Table VI. 
147842°— 20— Bull. 837 2 
