EXPERIMENTS CONDUCTED WITH A VIEW TO CONTROLLING DISEASE. 49 



TABLE XXVII. BLIGHT-PROOF STOCKS WITH GRAFTS LIABLE TO BITTER PIT. continued. 



Stocks. 

 Lord Wolselev 



Grafts. 



Cleopatra 

 Annie Elizabeth 

 Cox's Orange Pippin 

 Bismarck 



Fruits. 

 No. 



248 



Northern Spy 



Cleopatra 

 Annie Elizabeth 

 Cox's Orange Pippin 

 Bismarck 



27 

 1 



..Light crop 

 ..1 



Clean. 



68 



13 



Pitted. 



180 



14 

 1 



Per cent. 

 Pitted. 



72 



Remarks. 



1 



Dead 



Dead 



1 graft ; growth good 



1 graft; growth very poor 



About one-half pitted 



1 graft ; growth fair 



2 grafts; growth medium 

 2 grafts ; growth strong 

 1 graft ; growth fair 



The only graft which yielded a fair supply of fruit was that of Cox's Orange Pippin on Lord 

 Wolselev. Both stock and scion were badly affected with Bitter Pit. although Cox's Orange Pippin 

 on Northern Spy stock, grown in the general orchard and observed for four years in succession, was 

 only slightly affected, as shown in Report IV., Appendix II. 



(2) VARIETIES ON VARIOUS STOCKS, PLANTED IN BIRD-PROOF ENCLOSURE. The trees are now 

 in their fifth year from planting, with four exceptions which are in their third year, and a few of them 

 are beginning to bear a fair amount of fruit. During the next five years there should be abundance 

 of fruit produced, and it will be interesting to trace the influence of the various stocks on the yield 

 of fruit and amount of Pit (Figs. 61-66). 



At present no conclusions of any value can be drawn, since the trees are still comparatively young 

 and have not yet attained to their final shape, nor have they as yet produced a sufficient amount of 

 strong and vigorous fruit-bearing wood. While the experiments with stocks were undertaken primarily 

 to test the effect of the stock on the tree, with regard to the development of Bitter Pit, there are 

 many other points of interest observed at the same time. The effect of the stock on flowering, on 

 fruiting, on the vigour of the tree, etc.. are all noted, but the main points to be determined are which 

 stocks are associated with the least pitting and the largest yield, as well as the most vigorous tree. 

 When the trees have reached the age of ten years at least, results of some value should be available for 

 settling these points. 



Since the majority of the trees have now fruited, it was possible to check the naming of the varieties 

 from the nature of the fruit. It was found that four varieties which had been obtained from outside 

 sources were wrongly named. No. 19 is Scarlet Nonpareil ; No. 25, Reinette du Canada ; No. 28, 

 Rome Beauty ; and No. 52, Boston Russet. Seven of the varieties planted have failed to produce 

 fruit, even although six of them are now in their fifth year. 



The blooming periods for 1915 are not available, because it had not been decided to continue 

 the experiments before the beginning of 1916. The period of first bloom indicates when the first 

 flower had fully opened, full bloom when all the flowers had opened, and finished bloom when all the 

 petals had fallen. 



The pruning has been done throughout by the Principal of the School of Horticulture, and the 

 trees were thus trained on a definite plan. They were pruned on 19th July for the coming season, 

 and the object kept in view was to get as much fruit as possible in order to test the liability to Pit. 



The pruning was generally light, and when heavy it was done either to encourage growth which 

 was poor or to correct the shape of a one-sided tree. In some instances the tree had made such poor 

 growth that the stock was evidently unsuitable under the given conditions. Such trees are marked 

 with an asterisk (*). 



The following table gives the results for 1916, and the relative growth is also stated, based upon 

 the amount of wood formed during the season, being as much as three feet in some instances : 



