90 



MASS. EXPERIMENT STATION BULLETIN 198. 



Comparing first the fungi found in the two varieties during this season 

 it will be noted that Sporonema is much more abundant on the Early 

 Blacks, though even on this variety it is not of very great importance. 

 Phomopsis is considerably more common on the Early Blacks and Glomer- 

 ella on the Howes. Fusicoccum (end rot) is an important storage rot on 

 both varieties. Such differences as have been noted between the varieties 

 may well be accidental. Howes usually bloom three to eight days later 

 than Early Blacks, and thus might be in a condition of susceptibility to 

 certain fungi at different times from the Blacks. 



Table II. 



Cranberry Blooming Period at the Station Bog, East Wareham, 

 Mass. 



Certainly it would be unsafe to assume, without very extensive study, 

 that either variety was especially susceptible to a given fungus. 



The relative importance of the various fungi at different times during 

 the storage season is most easily seen from the graphs. Figs. 1 and 2. In 

 both varieties Phomopsis and Glomerella are most abundant early in the 

 storage season, and become gradually less important. Fusicoccum, on 

 the other hand, is relatively scarce early in the season, and becomes very 

 much more abundant as the season advances, so that after the 1st of 

 November end rot is more important than all the other rots combined. 

 That this relation does not always hold is proven by the records of the 

 succeeding year, but it seems probable that, in Massachusetts, end rot is 

 the most serious cause of decay in stored cranberries during the latter part 

 of the season. End rot in early stages can be identified on the fruit with a 

 fair degree of certainty by careful observers, and its importance as a cause 

 of loss in stored fruit has been emphasized by Mr. H. S. Griffith, chair- 

 man of the inspectors of the New England Cranberry Sales Company, in 

 his report for 1919 (page 21). 



The results of the second year's work as given in Table III show inter- 

 esting resemblances to those of the previous year. 



