256 The Commercial Apple Industry 



varieties as pollinizers when so many good commercial 

 sorts are readily available. 



It is important in any discussion of pollination to name 

 some of the varieties which are known as uncertain or self- 

 sterile as well as some of those known as self-fertile. 

 Cross-pollination with some other variety is usually advis- 

 able, since in most cases it increases the set of fruit. 



UNCERTAIN OB SEXF-STEBILE DEPENDABLE OB SELF-FEBTILE 

 VARIETIES. VARIETIES. 



Arkansas Ben Davis 



Tompkins King Baldwin 



Grimes Oldenburg 



Jonathan Rhode Island Greening 



Gravenstein Yellow Transparent 



Northern Spy Yellow Newtown 



Ortley 



Red Limbertwig 



Rome Beauty 



Esopus 



Twenty Ounce 



Winesap 



The following varieties are grouped according to their 

 desirability for securing best results in pollination. Each 

 column contains those which are well pollinated by any 

 one or more of the varieties in the same column. Certain 

 limitations should be placed on this table, since in certain 

 localities some compatible kinds bloom too early to pollin- 

 ate later-blooming varieties. However, the pollen of each 

 has an affinity for the pistil of the varieties in the same 

 column. 



