CONTROL, OF GRAPE-BEERY MOTH. 9 



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 applications. 



Esti- 

 mated 

 infes- 

 tation 



1915. 



Gallons of spray ma- 

 terial per acre. 



No. 



First. 



Second. 



Third. 



First. 



Second. 



Third. 



1 

 2 



3 

 4 

 5 



Roland Brown, Kelleys 

 Island. 



0. W. Brown, Kelleys 

 Island. 



Charles Duggan, Put- 

 in-Bay. 



W. R. Huntington, Put- 

 in-Bay. 



E. Manty, Venice. 



Catawbas . 



....do 



....do 



Catawbas, 



Concords. 



....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 



G 



John Schonhart, Venice . 



....do 



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 



