GRAPE ROOT-WOKM TNVESTTGATTONl^ TN 1907. 



65 



b}'^ no iiioans exceptional, and a cai'idiil siiivcy would ivveal liiindrcds 

 of acres of these newly Ix'ai'iuir vineyards in various sta«^es of de- 

 cline. It was to these new vineyards that the vineyardist looked for 

 the maintenance of the industry in the future, but their present con- 

 dition shows that when unprotected from the ^rape root- worm they 

 succumb to the attacks of this pvst even more rajiidly than do old 

 established vines. 



This rajjid decline in young vines, due to ijrape root-worm attack, 

 has opened up the question of the advisability of attemptino; to ren- 

 ovate these old, run-down vineyards, some of which are now yield- 

 ing a ton or less of grapes per acre and of which thei-e are sevei-al 

 thousands of acres throughout the gi-ape belt. 



RENOVATION EXPERIMENT ON AN OLD. RUN-DOWN VINEYARD. 



Early in the .spring of 1007 a vineyard of 10 acres was .secured at 

 North East, Pa., which had been so badly injured by the grape root- 

 w'orm that the decline in grape production had fallen from 8| tons 

 of grapes per acre, in 1905, to three-fourths ton per acre in 1907. 

 The vineyard is to receive severe pruning, thorough cultivation, 

 liberal applications of fertilizers, and thorough spraying. This treat- 

 ment is to continue for a series of years. 



The results of this treatment during the past summer are an in- 

 creased growth of canes over last year, and a great reduction in the 

 deposition of grape root- worm eggs — a direct outcome of the poison 

 spray application, as indicated in the following table: 



Tahi.k ll.—Slioirint/ cm/ ihiiosilion on xiirain il (iiid ilicck plats. 

 ClIKCK I rXSl'UAVKI)) I'l.AT. 



SPRAYED PLATS. 



Formula; ."> pounds liluc vitriol (copper sulphate). ."> ixiunds IIhk 



li'ud, 50 gallons water. 



ixiunds arsenate of 



PI,.\T NO. 1. I 



ffi^^:::::K-ti3. 



PI,.\T NO. 2. 



July 13 1 



July 22 ) 



August 13... 



2.5.71 



As has been previously stated, the wood growth in this vineyard 

 was light as a result of serious injury to the roots of the vines by the 



