Fertilizing Self-Stekile Grapes. 45 



Varieties Wliich Should Not Be Planted Alone. 



These Investigations have a practical bearing both on the selection of 

 varieties and on their arrangement when planted. The self-sterile liinda 

 cannot be expected to set fruit when they stand alone. Plate 1 shows 

 what was left of covered Eumelan clusters at the time the fruit ripened 

 on the uncovered clusters. It is seen that not a fruit developed when the 

 Eumelan was compelled to depend on itself for setting fruit. Herbert and 

 Barry likewise fail to fruit when dependent on their own blossoms for 

 pollination. Brighton does a little better. The best results which ita 

 covered clusters gave in these investigations are the three clusters shown 

 In Plate II. But self-sterile varieties may produce well-formed clustera 

 when located near enough to other kinds of grapes so that cross polli- 

 nation can occur. The clusters of Herbert and Barry, shown in Plates VI 

 and VII, and that of Brighton, shown in Plate III, were borne on vines 

 which were located favorably for cross pollination. 



The varieties which are listed in Class 3 have generally developed 

 clusters imperfectly filled and unmarketable and those named in Class 4 

 have failed to develop any fruit whenever cross pollination has been pre- 

 vented. If these varieties are planted at all they should be set close to 

 other varieties, which bloom at the same time, so as to provide for cross 

 pollination. 



The varieties which are named in Classes 1 and 2 produce well-formed 

 clusters of themselves. The covered clusters of Duchess and Diamond, 

 Illustrated in Plates IV and V, show what perfect clusters may develop on 

 varieties in these classes when the blossoms are self-pollinated. The va- 

 rieties named in Classes 1 and 2 may therefore be planted alone without 

 reference to cross pollination. 



Explanation of Plates. 



Plate I. Eumelan self-fertilized. 



Plate II. Brighton self-fertilized. 



Plate III. Brighton open to cross pollination (reduced one-third). 



Plate IV. Diamond self-fertilized (reduced one-third). 



Plate V. Duchess self-fertilized (reduced nearly one-third). 



Plate VI. Herbert (reduced nearly one-half). 



Plate VII. Barry (reduced nearly one-half). 



After Bulletin 157 was issued, inquiries came to the station 

 from various sources, bringing up the question whether one kind 

 of grape was any better fertilizer for the self-sterile lands than 

 another, or whether all that was necessary to provide for the 

 proper fertilizing of a self-sterile kind was simply to plant next 

 to it a variety which came into bloom with it. For the purpose 



