CERTAIN ELEMENTS IN NURSERY PRACTICE 183 



exact results : the character of the stocks must be one factor 

 in the program (page 169). Here opens an important prospect 

 in nursery practice. 



The reader will find the customary stocks mentioned under 

 the different entries in Part II (Nursery-List), but it may be 

 well to bring together a brief statement at this place. 



The almond is worked on seedlings of almond, peach, myrobalan plum, 

 and Prunus Davidiana. 



The apple is grown on seedling stock of the same species, Pyrus Mains. 

 It is dwarfed by working any variety on the Paradise or Doucin, which 

 are dwarf forms of the apple, grown from mound-layers. The seedling 

 stock is grown extensively in Kansas at present and is also imported from 

 France. 



Apricot is grown on seedlings of apricot, peach, and several kinds of 

 plum. 



Cherries are grown on mazzard stocks, which is a half-wild form of the 

 sweet cherry, Prunus avium, and on mahaleb, which is a distinct species 

 (Prunus Mahaleb) that does not produce edible fruit. Sweet cherries 

 are supposed to do best on mazzard and sour cherries on .mahaleb, but 

 they are likely to be worked rather indiscriminately. 



Chestnuts, whether American, European or Japanese, are mostly 

 Worked on native American stocks. Three species of Castanea are in- 

 volved here. 



Grapes are grown from cuttings. In regions where phylloxera renders 

 the growing of the wine grape (Vitis vinifera) impossible on its own roots, 

 the varieties are grafted on American stocks, chiefly on V . vulpina (riparia). 



Orange is worked on sour orange stock, rough lemon, grapefruit and 

 trifoliata, all representing different species and the trifoliata now con- 

 sidered to be of a distinct genus (Poncirus). 



Peach is budded on seedling peach stocks, the seeds being obtained 

 mostly from run-wild trees in the southern states. 



Pear is grown on seedling stocks of the same species (Pyrus communis) 

 imported from France ; also to some extent on American-grown seedlings 

 of Kieffer, and on American-grown and imported stock of the oriental 

 sand pears (Pyrus serotina, P. ovoidea and perhaps others). The pear is 

 dwarfed by budding it on Angers quince, which is mostly mound-layered. 



Pecan is grown on seedling pecan, and sometimes top-worked on estab- 

 lished native trees. 



