REMEDIAL MEASURES. 
75 
In addition to the above-described methods of comparing the effect 
of the treatment of this vineyard with a poison spray, an accurate 
count of the number of baskets of grapes picked from equal areas in 
the sprayed and unsprayed plats was made and their cash value for 
each season recorded. This data, covering the seasons 1907, 1908, 
and 1909, is presented in Table XXVIII. 
Plate VII, figure 1, shows the light growth of the vines in the 
unsprayed plat as compared with Plate VII, figure 2, showing the 
heavy growth in the sprayed plat after three years' treatment. 
RESULTS OF VINEYARD RENOVATION EXPERIMENTS. 
At the time this investigation was commenced the feeling was 
quite common among vineyardists of North East, Pa., that it would 
be useless to attempt to restore to their former productivity some of 
the vineyards very badly injured by the root-worm, and that it would 
be cheaper to tear out these old vines and replant the ground to 
new vines. In view of the fact that our survey had shown that 
many young vineyards just coming into bearing were also declining 
very rapidly under attacks of the pest, and that a run-down condition 
of old vines was very common throughout the entire grape belt, it 
was deemed desirable to investigate as to what could be done in the 
way of renovating a badly run-down vineyard. 
RENOVATION EXPERIMENT ON AN OLD VINEYARD. 
During the fall of 1906 our attention had been called to the condi- 
tion of 10 acres of old vineyard which in previous years had possessed 
the reputation of being very productive but had suddenly shown a 
rapid decrease in yield and also in growth of vine. The yield of this 
vineyard, which in 1905 was 6,597.5 pounds of fruit per acre, declined 
in 1906 to 1,697 pounds per acre, showing a decrease of 4,900.5 
pounds and barely covering operating expenses. When visited by us 
in the fall of 1906 the foliage of these vines was found to be riddled 
by the beetles of the grape root-worm, the cane growth was stunted, 
and many vines simply threw out tufts of puny shoots near the lower 
wire of the trellis. The roots were almost devoid of fibers and badly 
scarred by the feeding of grape root- worm larvae, and the fruit hung 
in scraggy clusters of undersized berries — in short, this vineyard had 
all the appearance of being in the last stages of production as a result 
of grape root-worm injury. In the spring of 1907 it was decided to 
undertake an experiment in this vineyard to determine if by ridding 
the vines of this pest, the vineyard could be restored to its former 
condition of profitable production. At this point it should be stated 
that the vineyard had received in previous years only indifferent 
cultivation and practically no fertilizing or spraying. The import ance 
