EXPERIMENTS CONDUCTED WITH A VIEW TO CONTROLLING DISEASE. 55 



TABLE XXXT. 

 RESULTS OF GRAFTING FROM PIT-FREE ON TO PIT-PRODUCING TREES, AND THE REVERSE. 



No. Variety of Pear. 



1 Josephine 



Josephine 



Pitted or Free. Source of Graft. 

 Pitted . . Tree free from Pit 



(supposed) 



. . Free in 1913 Tree with pitted fruit 

 (pitted in 1914) 



3 Winter Nelis Pitted 



4 Winter Nelis Free 



Tree free from Pit 

 Tree with pitted fruit 



Results. 

 10 Pears 4 clean and 6 pitted. Tree 



with very light crop and a large 



proportion badly pitted. 

 8 Pears all clean. Tree with medium 



crop and no sign of Pit. Two 



pitted pears were produced on 



graft in 1914, when the tree itself 



bore pitted fruit. 

 7 Pears all clean. Tree with very 



light crop and one pear pitted. 

 No fruit. Tree with light crop and no 



Pit. 



Although the experiment has been continued for four seasons 1912-13 to 1915-10 it is only 

 during the past season that the grafts have borne fruit of any consequence. In the first season there 

 was no fruit ; in the second season only two pitted pears were produced on the No. 2 Josephine graft ; 

 in the third season there was no fruit on any of the grafts, owing to the drought ; and in the last 

 season fruit was produced on the various grafts, with the exception of that on No. 4 Winter Nelis. 



As regards the Josephine pear trees, when the graft from the supposed non-liable tree was worked 

 on to a liable tree, there was 60 per cent, of Pit, but since the supposed non-liable tree horn which the 

 graft was taken had 69 per cent, of Pit in 1914, the results have no value. 



In the case of the Winter Nelis variety, the grafts from the non-liable tree bore seven pears, all 

 clean ; while the liable tree on which it was grafted had only a very light crop and one fruit pitted. 

 So that, as far as this experiment has gone, there is no fie finite indication that the graft or scion is influenced 

 by the stock on which it is worked, as regards Pit. 



13. AT GOVERNMENT EXPERIMENT ORCHARD, BLACKWOOD, SOUTH AUSTRALIA. 



The stock tests initiated by Mr. Quinn are arranged in three series, and date from August, 1908, 

 1910, and 1911 respectively. They are arranged on such a definite plan and have such a judicious 

 combination of stocks that they cannot fail to yield results of the highest value. 



TABLE XXXII. 



TESTING THE INFLUENCE OF DIFFERENT STOCKS ON THE DEVELOPMENT OF PIT 1915-16. 

 SERIES 1. NORTHERN SPY ROOTS WITH INTERMEDIATE STOCKS. 



No. 



Variety. 



Stocks. 



1 Baldwin 



Total 

 Yield. 



Ibs. oz. 



PITTED. PERCENT. PITTED. 



2 

 g 



Baldwin 

 Baldwin 



Off 



Trees. 

 Ibs. oz. 



10-11 

 1-0 



4 Cleopatra . . 



5 Cleopatra . . 



6 Cleopatra . . 



7 Cleopatra (Q.) 



8 Cleopatra (Q.) 



Dunn's Favourite 



on Spy . . 14-2 

 Rokewood on Spy 2-2 

 Spy . . . . ' 

 Dunn's Favourite 



on Spy .. 62-11 

 Rokewood on Spy 40-2 

 Spy . . . . ' 25-2 

 Dunn's Favourite 



on Spy . . 37-8 

 Rokewood on Spy 89-10 72-13 



Wind- Off 

 falls. Trees. 

 Ibs. oz. Ibs. oz. 



Wind- Off Wind- 

 falls. Trees, falls. 

 Ibs oz. 



0-2 



3-4 

 1-0 



0-3 



23-3 100-0 

 50-0 



Per 



cent. 



Pitted. 



24-3 



47-0 



