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 importance 



