20 



BULLETIN 550, U. S. DEPARTMENT OF AGRICULTURE. 



EXPERIMENT IN THE MOORHEAD VINEYARD, MOORHEADVILLE, PA., 1915. 



The experimental work in the Moorhead vineyard was conducted 

 in the same section as in 1914, but the arrangement of plats was 



somewhat changed. The plat 



Mrsr 



s/o&rs* 



7 



2ZZ 



2P- 



&sr 



J c//£-c/r /q^72r J 



c 



SOC77V 



that had the lightest infestation 

 was chosen as check, while the 

 check of the 1914 season was 

 sprayed. The adjacent sections 

 of the vineyard were sprayed once 

 by the owner, soon after July 1, 

 with arsenate of lead (paste), 3 

 pounds, and Bordeaux mixture, 

 50 gallons, to control the grape 

 rootworm; the spray was applied 

 with "set nozzles." Counts were 

 made from these sections adjacent 



to the experimental block and they are recorded as checks, B and C. 



The arrangement of plats is shown by the diagram (fig. 5). 



Table 10. — Spray mixtures used and methods and dates of application in experimental 

 plats, Moorhead vineyard, Moorheadville, Pa., 1915. 



Fig. 5.— Diagram showing arrangement of plats in 

 the vineyard of Mr. J. M. Moorhead, Moorhead- 

 ville, Pa., 1915. The sprayed plats are marked 

 with Roman numerals and the check plats with 

 letters. (Original.) 





Dates of 

 spraying. 



Arsenate 

 of lead 

 (paste). 



Bordeaux mixture. 



Laundry 

 soap. 



Nicotine 

 sulphate. 



Water. 



Method of ap- 

 plication. 



Plat No. 



Lime. 



Copper 

 sulphate. 



I 



July 1,20.. 



July 1,20.. 

 July 1,20.. 



July 1,21.. 



Pounds. 

 3 



5 

 3 



3 



Pounds. 

 3 



3 



3 



Pounds. 

 3 



3 

 3 



3 



Pounds. 

 1 



1 

 1 



1 



Pints. 



Gallons. 

 50 



50 

 50 



50 



Sprayer ("trail- 

 er") drivenin 

 alternate al- 

 leys. 



Every alley. 



II 





Ill 



1 



IV... . 



leys. 

 Every alley. 







Table 11. — Percentage of infestation in experimental plats, Moorhead vineyard, Moore- 



headville, Pa., 1915. 





Number 

 of vines. 



Number 



of 

 clusters. 



Total ber- 

 ries. 



First brood. 



Second brood. 



Plat No. 



Infested 

 berries. 



Infesta- 

 tion. 



Infested 

 berries. 



Infesta- 

 tion. 



I 



20 

 20 

 20 

 20 

 20 

 20 

 20 



'820 

 975 

 726 

 975 

 813 

 785 

 756 



29, 130 

 34,450 

 22,411 

 25, 512 

 26, 350 

 21,951 

 22,478 



90 

 112 



49 

 903 

 141 

 715 

 822 



Per cent. 



0.31 

 .32 

 .22 



3.54 

 .54 



3.25 



3.65 



1,099 

 717 

 943 



4,860 

 1,070 

 4,997 

 7,736 



Per cent. 

 3.77 



II 



Ill 



4 21 



Check A 





IV 



4 06 



Check B 



22 81 



Check C 









