GRAPE ROOT-WORM TNVESTTGATTONS IN 1907. 



65 



by no means exceptional, and a careful survey would reveal hundreds 

 of acres of these newly bearing- vineyards in varions stages of de- 

 cline. It >vas 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 grape root-worm they 

 succumb to the attacks of this pest e\en more ra]iidly than do old 

 established vines. 



This rapid decline in young vines, due to gi-ape root-woi"m attack, 

 has opened u)) the question of the advisability of attemi)ting to ren- 

 ovate these old, run-down xineyards, some of which ai'e now yield- 

 ing a ton or less of gra])es per acre and of which there are several 

 thousands of acres throughout the gra))e l)clt. 



RENOVATION EXPERIMENT ON AN OLD, RUN-DOWN VINEYARD. 



Early in the spring of 1007 a \ineyai'd of 10 acres was secured at 

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

 worm that the decline in grape ])rodnction had fallen from -^^ tons 

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

 The vineyard is to receive severe prnning, thorough cultivation, 

 liberal applications of fertilizers, and thonxigh spi-aying. This ti'eat- 

 ment is to continue for a series of j^ears. 



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

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

 dei)osition of grape i-oot-worm eggs — a direct outcome of the poison 

 s})ray application, as indicated in the following table: 



Tai'.i.e II. — l<li(>iriii</ If/!/ <l<ii')siti(iii on sprdi/cil <ni(l check plals. 

 fUKCK 1 INSriiAVKln I'l.AT. 



Dates of 



aiiplica- 



tion. 



When 

 'xaiiiiiieil. 



August 12. 



Number of egs clusters found. Esti- 

 mated 

 i num- 

 ber of 

 eggs. 



Large. 



97 



Medium. Small. 



238 



Total. 



485 11,730 



Average num- 

 Num- Num- i ber of eggs, 

 ber of ber of 



vines, canes. 



Per 



vine. 



469. 2 



Per 

 cane. 



SPRAYED PL.VTS. 



juntis lihie vitriol (copper sulphate). ."> pounds liim 

 lead, r>() ;j;alloti« water. 



:! pounds arsenate of 



As has been pre\iously slated, the wood growth in this vineyard 

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



