82 
THE GRAPE ROOT-WORM. 
pounds of arsenate of lead to 50 gallons of water. On July 2, 1908, a 
second application was made, using the same formula as for the first 
application. The spray was applied with a traction sprayer at a 
pressure of about 100 pounds, and about 100 gallons of fluid were 
used per acre, covering the vines quite thoroughly with a fine spray. 
The whole 5 acres were included in each of these two spray applications. 
As a result of this treatment most of the vines made quite a vigorous 
growth of wood, which gave a good supply of bearing canes for next 
season. Owing to the severity with which these vines were cut back 
in the spring, the cash value of the crop from the 5 acres was $31 .02. 
The treatment given this section of vineyard in 1908 was duplicated 
during the summer of 1909. The same amount of fertilizer was 
applied, and two applications of spray were made, the first applica- 
tion June 29, the second July 8. As a result of the second season's 
treatment the vines have taken on a healthy appearance and made a 
vigorous growth of new canes. The number of grape root-worm 
beetles has been reduced to a minimum, as shown by the small amount 
of feeding on the foliage and by the number of egg clusters deposited. 
An examination made on July 24 showed but nine egg clusters on 25 
sprayed vines as against 73 egg clusters on the same number of un- 
sprayed vines. Diggings made in search of larvae showed a similar 
condition. Only three larvae were found about the roots of five 
sprayed vines as against 55 larva? found about the roots of five un- 
treated vines. The crop value for the season of 1909 for the 5 acres 
was $213.92 as against $31.02 for the season of 1908. The vineyard 
has made sufficient growth of vines during the season to enable the 
owner to put up enough bearing canes to produce a full crop for 1910. 
The additional cost of the operations of spraying and fertilizing for 
the seasons of 1908 and 1909, over and above ordinary vineyard 
management, amounted to $135, itemized as follows: 
Nitrate of soda, 1,000 pounds $25.00 
Complete fertilizer, 2 tons 70. 00 
Spray material and labor, $4 per acre 40. 00 
The success of this attempt to restore this 5 acres of vineyard to 
its former state of productivity can not be better summarized than 
by presenting the following figures showing net weight of fruit and 
the crop value for the years 1904 to 1909, inclusive: 
Pounds. Value. 
1904 11,630 $127.51 
1905 23,705 410.77 
1906 21,130 435.72 
1907 3,195 55.92 
1908 4,390 31.02 
1909 19,935 213.92 
