102 Pecan-Growing 



Group II 



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Bradley 2 4/4 4/6 4/25 5/2 5/11 5/9 G3 110 



Curtis 2 4/5 4/14 4/29 5/7 5/14 5/14 60 125 



Teche 2 4/12 4/14 4/27 5/3 5/13 5/11 55 150 



Frotscher 2 4/4 4/11 4/27 5/3 5/12 5/11 30 150 



Money-maker ... 2 4/4 4/5 4/25 5/2 5/9 5/6 82 155 



Appomattox .... 2 4/5 4/7 4/25 5/3 5/8 5/7 25 125 



Russell 2 4/5 4/6 4/27 5/5 5/11 5/8 76 135 



Stuart 2 4/14 4/17 4/31 5/8 5/14 5/14 60 120 



Van Deman .... 2 4/5 4/5 4/25 5/1 5/10 5/7 35 170 



There is no doubt that self-sterility in pecans is due pri- 

 marily to the interval between the receptive stage of the pistil- 

 late flowers and the shedding of the pollen. Those varieties 

 in Group I, in Avhich the pistillate flowers are receptive at the 

 time the pollen sheds, present no difficulties in the problem 

 of self-fertility. However, those in Group II in which the 

 pistillate flowers are past the receptive stage and the stigmas 

 dried before the first pollen sheds are necessarily self-sterile 

 in varying degrees according to the percentage of dried or 

 calloused stigmas on the tree before the pollen begins to shed. 

 In Group I the stigmas of the pistillate flowers remain in a 

 fresh undried condition for a period of several days, consider- 

 ably longer than those in Group II. However, all do not 

 become receptive at the same time, and there is some danger 

 of the varieties of Group I shedding their pollen too early for 

 pollinating all their own pistillate flow^ers, i.e., those coming 

 into the receptive stage late. A number of stigmas of the 

 Alley and the Eandall varieties are often still fresh and viscid 

 after practically all the catkins or staminate flowers have dried 



