THE RECIPROCAL INFLUENCES OF STOCK AND CI ON 



571 



dwarfing effect. Some Wildgoose plums are said to be more fruitful 

 on peach roots. '^'* 



These instances are introduced here, not as showing a general tend- 

 ency toward any marked influence of stock on cion, but rather the 

 dearth of more positive evidence. Considering the amount of top- 

 working that has been done, little evidence of a change of practical im- 

 portance has been accumulated. There has been a general tendency 

 to assume that if there is any influence on the size of fruit the dwarfing 

 stocks tend to produce larger fruit. Most of the instances just cited 

 fail to bear out this idea. 



In Victoria Cole"*" reports that many varieties of plums which are 

 shy bearers on Myrobalan stock are prolific on Marianna. "Although 

 some varieties . . . somewhat overgrow this stock it is no great fault 

 but an improvement — it influences the bearing qualities of varieties so 

 inclined to overgrow." 



In France some years ago, according to Pepin, ^''^ there was a dwarf- 

 ing apple stock, neither Paradise nor Doucin, known as the Pommier 

 hybride or batard; grafts on this grew vigorously but bore little fruit 

 and that little was inferior. 



Bioletti,^^ reporting on the St. George grape stock, states: "In some 

 cases the vines grow well but the crops are unsatisfactory. This has 



Table 4. — Product of Panariti Grapes on Different Stocks at Fresno, Cal. 

 {After Husmann^*) 



Stock 



Yield (in pounds 

 per vine) 



1917 



1918 



Sugar content 

 (Balling scale) 



1917 



1918 



Acid as tartaric 



(grams per 100 



cubic centimeters) 



1917 



1918 



Adobe Giant 



Aramon X Rupestris Gan- 



zin No. 1 



Dog Ridge 



Lenoir 



Mourvedre X Rupestris 



No. 1202 



Riparia Gloire 



Riparia X Rupestris No. 



3309 



Rupestris St. George 



Salt Creek 



Solonis X Riparia No. 



1616 



Average 



21.0 

 3.0 

 1.5 



8.0 

 5.0 



17.0 

 6.5 

 8.0 



24.5 



10.2 



7.5 



11.0 

 3.0 

 2 



1.5 

 2.0 



20.0 

 2,0 

 1.5 



19.0 



6.95 



30.5 



28.0 

 26.5 

 28,0 



23.5 

 23.5 



28.5 

 28.5 

 28,0 



29.0 



27.4 



27.0 



26,0 

 28.0 

 26.0 



28.0 

 30.0 



26.0 

 26.0 

 26,0 



26.0 



26.9 



0.9675 



0.7650 

 0.8300 

 0.6450 



0.8700 

 0.8850 



0.8650 

 0.7800 

 0.7800 



0.6900 



0.80775 



0.8770 



0.8255 

 0.8250 

 0.7500 



0.7575 

 0.9450 



0.8250 

 0.8550 

 0.8175 



0.8325 



0.8310 



