10 



BULLETIN 550, U. S. DEPARTMENT OF AGRICULTURE. 



Hand picking of wormy fruit was done Juty 7 and 8 and again 

 between July 25 and August 1. The time of the first picking occurred 

 about 10 days after the falling of the blossoms. The actual time 

 expended in this work was 35.5 hours for the two men employed, or a 

 total of 71 hours. The second picking, which was more or less inter- 

 rupted by rain, developed that about 12 per cent of the berries were 

 wormy. 



The counts of wormy berries taken at harvest time showed the 

 following percentages of infestation : 



Hand-picked plat. 

 Check 



South end. North end. 



Per cent. Per cent. 



84.4 24.9 



68.2 25.3 



This shows as a curious result that the hand-picked area was more 

 heavily infested than the check, probably owing to the flight from 

 the vineyard at large of moths which settled in this narrow protected 

 area. 



Experiment in Moorhead Vineyard, Moorhead ville, Pa., 1914. 



A plat of 16 rows, 2 acres in area, was chosen in the middle of the 

 vineyard of the late R. E. Moorhead. The infestation was com- 

 paratively uniform throughout. Hand picking of infested fruit was 

 done three times, July 2 and 3, again from July 17 to 21, and again 

 from August 10 to 15. The total time occupied in treating the 2 

 acres was 55 hours, or 27J hours per acre. 



Counts of infested berries from four crates of grapes from the hand- 

 picked plat were made and the same from the check plat. The 

 following shows the percentage of infestation: 



Hand picked i 14. 7 per cent. 



Check 27. 4 per cent. 



Experiment in the McDonald Vineyard, North East, Pa., 1915. 



The heavily infested ends of 12 rows of a vineyard section adjoining 

 a woodlot were chosen for this experiment. The picked area extended 

 along the rows about 70 feet. The plat was picked over once, August 

 5 and 6, requiring a total of 22 hours' work for approximately 

 one-fifth of an acre. 



Counts taken just before harvest from representative vines in the 

 hand-picked plat and in the check plat showed the following results: 



Table 2. — Counts in hand- picking experiment, McDonald vineyard, North East, Pa., 1915. 



Plat. 



Number 



of vines. 



Number 



of 

 clusters. 



Number 



of 

 berries. 



Infested 

 berries. 



Infested 

 berries 

 per 100 



clusters. 



Infesta- 

 tion. 





12 

 12 



520 

 546 



13, 864 



16, 513 



2,592 

 6,162 



498.4 

 1,136.6 



Per cent. 

 18.12 



Check 



34.93 







