REPORT OP COMMITTEE ON PUBLICATION 231 



last spraying in the latter part of July. Wherever the July spraying was 

 carefully applied the percentage of wormy grapes was greatly reduced, the 

 results averaging only 11 to 12 per cent of wormy berries. In nearby un- 

 sprayed vineyards from 32 to 64 per cent of the crop was wormy and the 

 total weight of merchantable grapes reduced from one-third to one-half. 



The experiment plots near Euclid, Ohio, were part of a vineyard of 

 some seventeen or eighteen acres. Each plot consisted of about two-thirds 

 of an acre thoroughly sprayed with its particular kind of spray. 



The soil throughout these plots is similar and the cultivation and soil 

 fertilization were practically the same, but the slope varied slightly. The 

 infestation of berry moth the season previous was also fairly uniform 

 throughout the vineyard, so gave promise of a similar condition in 1914. 

 The set of grapes was much heavier than in 1913, and this usually means 

 that the grape crop will not average quite so wormy as on years when the 

 set is extremely light. 



In 1914, various combinations of sprays were used with different methods 

 of application. Arsenate of lead at varying strengths, with and without 

 Bordeaux, with and without soap for a sticker and spreader. Copperas, or 

 iron sulphate, with lime was used as a sticker, spreader and fungicide in 

 combination with arsenate of lead on one plot, and in 1914 flour paste was 

 tested as a spreader and sticker for the arsenate of lead. Syrup or cheap 

 cooking molasses was used in some test plots in 1914, in the late July spray- 

 ing. In a few cases a considerable amount of injury to Ives grapes seemed 

 to be due to the use of cheap molasses for a sticker and spreader with the 

 arsenate of lead. The plot sprayed with this material was also more 

 severely injured by the berry worms than adjoining plots sprayed with 

 arsenate of lead, Bordeaux (2-3-50) and two pounds of dissolved soft soap 

 in each 50 gallons. The plots sprayed with arsenate of lead and soap without 

 Bordeaux had some 8 per cent less of wormy grapes than where molasses 

 was used, hence the decided advantage of using soap, with the poison, as a 

 spreader and sticker. 



Check Unsprayed. 



Number of bunches, 26; sound berries, 749; wormy berries, 373; per 

 cent wormy, 33.2. 



Plot 1. 



Sprayed June 9, 1914; 140 gallons per acre. Arensate of lead, 2 pounds; 

 copper sulphate, 2 pounds; lime, 3 pounds; soft soap, 2 pounds; water, 50 

 gallons. 



Sprayed same spray June 24, 200 gallons per acre. 



Sprayed July 31, 200 gallons per acre. Arsenate of lead, 3 pounds; soft 

 soap, 2 pounds; water, 50 gallons. Added nicotine sulphate, 1 part to 1,000, 

 for leaf hoppers. 



Counted September 14, 1914. Number of bunches, 19; sound berries, 

 1,004; wormy berries, 22; per cent wormy, 2.14. 



Plot 2. 



Sprayed June 9, 1914; 140 gallons per acre. Arsenate of lead, 2 pounds; 

 soft soap, 2 pounds; water, 50 gallons. 



