Xjew York Agkicultural Experiment Station. 393 



Brighton gave little fruit or none when fertilized with the self- 

 sterile or imperfectly self-fertile kinds, Creveling, Salem, Aminia, 

 Wyoming, Lindley, Eldorado, Merrimack and Herbert. The use 

 of varieties having a higher degree of self-fertility gave corre- 

 spondingly better results as is shown in the records of ISTectar, 

 Vergennes and Jefferson, while the use of strongly self-fertile 

 kinds for fertilizers gave more perfect clusters of fruit as is shown 

 by the records of Rochester, Catawba, Worden, IvTiagara and Star 

 tion 125. 



Results corresponding to those given above were obtained with 

 the different classes of varieties which were tried as fertilizers on 

 Eldorado, Eumelan, Herbert, Hercules, Lindley, Merrimack, 

 Salem and Wyoming. So far as these tests are concerned, they 

 support the theory that the failure of self-sterile or imperfectly 

 self-fertile grapes in setting fruit is not generally due to imper- 

 fect development of the pistils because when they are supplied 

 with pollen from strongly self-fertile grapes they set fruit abun- 

 dantly. It has been observed that blossom buds of certain varie- 

 ties may in some cases drop off before the flowers open. It has 

 also been observed that when the vines are not in good condition 

 certain varieties which generally produce well-filled clusters of 

 perfect fruit may have a large proportion of imperfect clusters. 

 It appears, therefore, that failure in setting fruit may be due to 

 various causes, prominent among which is the lack of proper polli- 

 nation. 



GRAPES CLASSIFIED ACCORDING TO THEIR BLOOM- 

 ING SEASON. 



In selecting varieties of grapes to be used as fertilizers for 

 those kinds which are either self -sterile or imperfectly self-fertile, 

 it seems desirable to chose not only strongly self -fertile kinds, 

 but also kinds which come into blossom at the same time with 

 those which they are expected to fertilize. The following lists 

 have been arranged to show approximately the comparative sea- 

 son of blooming of the different varieties of grapes. The arrange- 



