New Yoek Agricultukal Experiment Station. 8G5 



enabled it to resist this cold weather a little better than the other 

 stocks. 



During 1906 the grape fidia, which had appeared in the vine- 

 yard a few years previous, began to affect some of the vines 

 severely and this injury continued to some extent throughout the 

 remaining years of the experiment, although repressive measures 

 were fairly successful in controlling the insect. In 190 G, addi- 

 tional vines died ; on Gloire stock thirty-four, on St. George 

 twenty-seven, on Clevener thirty-five, and on their own roots nine. 

 These dead vines were, in many cases, weaklings injured by the 

 severe weather of the two winters past. In 1907, the vines 

 appeared to be making good growth and there were fair prospects 

 for a good harvest of grapes, but in August a hailstorm ruined 

 the crop so that the fruit was never picked; and again in 1910 

 the crop was entirely destroyed by hail. 



The death of so many vines during early 

 Grafted vines stages of the experiment, severe attacks of 

 more fidia during one or two seasons, and the two 



productive. disastrous hailstorms have made it impos- 



sible to secure any satisfactory amount of 

 data upon which to base definite conclusions regarding produc- 

 tivity of the individual varieties. Yet throughout the whole course 

 of the work, observations have shown that grafted vines were fruit- 

 ing better than vines of the same varieties on their own roots. Not 

 only were more bunches set upon the grafted vines, as shown by 

 actual count, but the bunches and the berries also grew larger, 

 resulting in less unmarketable fruit. Such data as were secured 

 from three fairly satisfactory harvests — those of 1908-09-11 — 

 give evidence in the same direction. Computations, based on the 

 actual weight of fruit harvested from each vine, would give an 

 average acre yield of 214 tons of grapes from varieties on their 

 own roots, 3 tons from those on St. George stock, 3.4 tons from 

 those on the Gloire stock and 3.6 tons from those on Clevener 

 roots. These yields are, of course, small, and perhaps ought not 

 to give any great weight to an experiment which has lasted through 

 eleven years. In reality, during this time only one satisfactory 

 harvest was secured, that of the year 1911; and the figures for 

 28 



