CONTROL OF THE GRAPE-BERRY MOTH. 



15 



the spray was applied directly to the grape clusters with "trailers" it 

 did not adhere to the waxy skin of the grape berries, except when the 

 solution to which soap had been added was used. These features, 

 (1) the application of the spray directly to the grape clusters and (2) 

 the addition of soap to the solution, 

 were the most important changes 

 which were suggested by this sea- 

 son's work. 



EXPERIMENT IN THE MOORHEAD VINEYARD, 

 MOORHEADVILLE, PA., 1914. 



wesr 



Experimental work in the Moor- 

 head vineyard was conducted in a 

 section of 38 rows, comprising about 

 5 acres, which was divided into 4 

 plats of 8 rows each and one of 6 

 rows, the latter used as the check 

 plat. The arrangement of the plats is shown in the diagram (fig. 1). 

 The vineyard was rather evenly infested throughout. 



Table 4. — Spray mixtures used, methods and dates of application, and percentages of in- 

 festation in experimental plats, Moorhead vineyard, Moorheadville, Pa., 1914- 



Fig. 1. — Diagram showing arrangement of ex- 

 perimental plats in Mr. J. M. Moorhead's vine- 

 yard, Moorheadville, Pa., 1914. (Original.) 



Plat No. 



Dates sprayed 

 with set nozzles. 



Dates 

 sprayed 



with 

 trailers. 



Arsenate 

 of lead 

 (paste). 



Bordeaux 

 Lime. 



mixture. 



Copper 

 sulphate. 



Laundry 

 soap. 



Water. 



Infesta- 

 tion. 



I 



June 9, 23, and 

 July 9 





Pounds. 

 3 

 3 

 3 

 3 



Pounds. 

 3 

 3 

 3 

 3 



Pounds. 

 3 

 3 

 3 

 3 



Pounds. 



Gallons. 

 50 

 50 

 50 

 50 



Per cent. 





25.6 



n 









26.7 



in 



June 23 



July 9 

 July 10 





27.8 



IV 



do 



» 1 



22.9 







31.8 



sprayed. 



















i Last application only. 



Though the experiments in this vineyard showed a consistent 

 reduction of infestation, definite control of the grr.pe-berry moth was 

 not established. In one plat the results appeared somewhat more 

 favorable than in the others and offered a suggestion for further 

 investigation. Soap was added to the spray mixture and "trailers" 

 were used in applying it, but as these changes had been made only 

 for the last application they could not affect the results materially. 



EXPERIMENT IN THE PHILLIPS VINEYARD, NORTH EAST, PA., 1914. 



Experimental work in the Phillips vineyard was conducted in a 

 section which included 44 rows, covering about 7 acres. It was 

 divided into 7 plats of 6 rows each. The middle row of each plat 

 and the two rows at one side were chosen for checks. The arrange- 

 ment of the plats is shown in the diagram (fig. 2). 



