February, '16] GOODWIN: GRAPE BERRY WORM 103 



E. L. Steuks, Sandusky, O., 1915 



Sprayed August 8 to 12 



As. of lead 3# Corona Dry Bordeaux 2-3-50 Soft Soap 2# 



Counts October 7, 1915 



Hand-sprayed August 8 to 12 



Wordens 3% wormy Catawbas 2% wormy Concords 3.5% wormy 



Hand-sprayed August 15 to 17 



Concords 9% wormy Catawbas 10% wormy 



Unsprayed 



Concords 77% wormy Wordens 46% wormy Catawbas 89% wormy 



The experiments for the control of the grape berry worm in 1915 

 were more extensive than in the years just preceding. The work was 

 conducted in several different grape growing districts in northern 

 Ohio in order to ascertain the practical value of the previous experi- 

 mental work. Wherever the cooperators followed instructions and 

 made the heavy application of spray carefully and thoroughly, good 

 results were obtained, averaging less than 15 per cent wormy in the 

 face of heavy infestations, ranging from 28 to 97 per cent wormy in 

 unsprayed vineyards. The various cooperators who sprayed at other 

 times, not following instructions, only confirmed the striking results 

 obtained by spraying at the proper times. A large number of such 

 instances have been carefully observed, although not all of the spray- 

 ing was done by cooperators in the berry worm control work. 



The studies of the life-history and control of the grape berry worm 

 have included a large amount of experimental work. The moist 

 leaves lying on the ground and upon which the berry worm spun up 

 in the fall were gathered and destroyed on a fairly large acreage, 

 resulting in a material reduction of the berry moth the next summer. 

 The owner found he could pick over from one to three acres per day 

 depending upon the condition of the vineyard. 



Plowing in the latter part of May, covering those pupse still in the 

 vineyard, seemed to reduce the numbers of moth in June but was only 

 partially effective. 



Spraying throughout the season has been tested in comparison with 

 one, two and three sprayings. Varying amounts of poison were used 

 with molasses, iron sulfate and lime, soap gelatin, flour paste, nicotine 

 sulfate and different strengths of Bordeaux mixture as spreaders or 

 stickers and for fungus disease control. The arsenate of lead, soap, 

 Bordeaux combination has proved the most practical, the cost and 

 labor of preparation being less and the results obtained indicate it 

 was more effective than other combinations. 



Many kinds of sprayers and equipment were used. The power 

 sprayers with narrow trucks and 100-gallon tank making the ma- 



