546 Report of the Horticulturist of the 



Mary Favorite, Math'ilde, Metternich, Monroe, Opal, Poughkeep- 

 sie, Profitable, Rochester, Senasqua, Shelby, Telegraph, Winchell. 



In the lists of grapes which give somewhat loose though mar- 

 ketable clusters, when self-fertilized, and of those which give clus- 

 ters too loose to be called marketable, certain varieties have given 

 somewhat variable results in different tests, in some instances 

 showing as great variation as in any of the cases cited above. 



It has been shown on preceding pages that in certain varieties 

 the degree of self-fertility is not unchangeable. Its limits, there- 

 fore, may not be defined with mathematical exactness, yet with 

 rare exceptions its variableness in any variety is confined within 

 rather narrow limits. Not all varieties have shown marked differ- 

 ences in the results of different tests. In fact in the majority of 

 cases the results have been practically similar with the same variety 

 in different seasons and different locations, so far as tested. A 

 classification based on such tests as have been reported above will 

 show with considerable accuracy the normal degree of self-fertility 

 of a variety, although the limits of the classes will necessarily 

 be somewhat variable. Such a classification is given below. It 

 is probable that slight changes may be made in it after further 

 testing of these varieties. Other varieties may need to be trans- 

 ferred from the lists of self-sterile to the list of imperfectly'; self- 

 fertile sorts as has already been done with Brighton, Lindley, 

 Eumelan, Marion, Norwood and Woodruff. For all cultural pur- 

 poses, however, such grapes may still be considered as belonging 

 to the category of self-fertile sorts. Changes from one class to a 

 widely different class, as from the self-sterile class to either of the 

 classes of grapes capable of producing marketable self-fertilized 

 clusters, are not to be expected. In other words, it is believed that 

 the classification as given below is on the whole sufficiently reliable 

 to serve the purposes of grape growers who are seeking information 

 as to which varieties are able to produce good clusters of fruit 

 when planted alone and with which ones cross-pollination is neces- 

 sary to the production of good clusters. 



