GRAPE ROOT-WORM INVESTIGATIONS IN 1907. 65 
by no means exceptional, and a careful survey would reveal hundreds 
of acres of these newly bearing vineyards in various stages 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 grape root-worm they 
succumb to the attacks of this pest even more rapidly than do old 
established vines. 
This rapid decline in young vines, due to grape root-worm attack, 
has opened up the question of the advisability of attempting 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 there are several 
thousands of acres throughout the grape belt. 
RENOVATION EXPERIMENT ON AN OLD, RUN-DOWN VINEYARD. 
Early in the spring of 1907 a vineyard 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 production had fallen from 34 tons 
of grapes per acre, in 1905, to three-fourths ton per acre in 1907. 
The vineyard is to receive severe pruning, thorough cultivation, 
hberal 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: 
TABLE II.—Showing egg deposition on sprayed and check plats. 
CHECK (UNSPRAYED) PLAT. 
Average num- 
Number of egg clusters found. | Esti- 
Dates of When. id si mated | Num- | Num- ber of eggs. 
applica- esanined num- | ber of | ber of | 
tion. ic : ber of | vines. | canes.| Per Per 
Large. | Medium.| Small. | Total. eggs. | vine.” haaabe: 
poet EE Ti 4 I- TESis 
August 12... 97 150 238 485 | 11,730 25 76 | 469. 2 | 154. 37 
SPRAYED PLATS. 
K » 
Formula: 5 pounds blue vitriol (copper sulphate), 5 pounds lime, 3 pounds arsenate of 
lead, 50 gallons water. 
PLAT NO. 1. | | | 
| | | 
July 22.772 _/}August 13... 1 21| 84 56 | 1,440 25 66| 57.6| 25.71 
PLAT NO, 2. | 
July ta august 13...| 4 17| 25 46 | 960 25 85 | 384)! 11.29 
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 
