New York Agricultural Experiment Station. 559 



VINEYARD 11. 



1897. 1898. 



Black Eagle June 26 to July 3 June 15 to June 21 



Brighton June 20 to July 1 June 15 to June 21 



Brilliant June 24 to July 3 June 15 to June 20 



Canada June 20 to July 1 June 11 to June 16 



Clinton June 14 to June 21 June 7 to June ? 



Eaton June 24 to July 1 June 13 to June 18 



Elvira June 19 to June 26 June 10 to June 15 



Etta June 20 to July 1 June 12 to June 17 



Gartner June 24 to July 1 June 13 to June 18 



Iona June 24 to July 3 June 16 to June 25 



Isabella Seedling June 24 to July 1 June 12 to June 18 



Marion .Tune 14 to June 20 June 7 to June ? 



Mills June 24 to July 3 June 16 to June 25 



Nectar June 28 to July 3 June 15 to June 21 



Noah June 12 to June 17 



Olita June 24 to July 1 June 15 to June 23 



Paradox June 24 to July 1 June 13 to June 19 



HOW MAY SELF-STERILITY IN THE GRAPE BE 

 ACCOUNTED FOR? 



With nearly all of the varieties under experiment the discharge 

 of pollen from the anthers has been observed. In these eases it 

 cannot be held that self -sterility is due to an insufficient supply of 

 pollen. 



Some of the self -sterile varieties have long stamens. That long- 

 stamened varieties become self-pollinated has already been shown. 

 The shert-stamened varieties are self-sterile or nearly so. Does self- 

 pollination occur with them? It certainly does in some instances; 

 for covered clusters of certain short-stamen ed grapes have occasion- 

 ally produced a little fruit. If self-pollination occurs with some 

 short-stamened varieties it is reasonable to assume that it occurs 

 with all such varieties. It seems impossible that all the pollen of 

 a covered cluster could be discharged and none of the pistils be- 

 come pollinated even if the stamens are short. 1 



l Green found that covered clusters of Lindley and Brighton set no fruit, 

 but they set fruit perfectly when clusters of Delaware blossoms were inserted 

 in the bags with them at the blooming period. Both Lindley and Brighton 

 have short stamens. Cross Fertilization of Grapes. Minn. Exp. Sta. Bui. 

 32:229. 1893. 



