New York Agricultural Experiment Station. 109 



I. ANOTHER APPLE ROT FOLLOWING SCAB. 



In Bulletin No. 227 of this Station^ is described an apple rot 

 following scab, to which the popular name " Pink Rot " has been 

 given. Some weeks after that Bulletin had been sent to the 

 printers, specimens of diseased Rhode Island Greening apples 

 were received at the Station from a cold storage fruit house in 

 Orleans county. The decayed areas on these fruits presented the 

 same general appearance as the spots caused by Ccphalothccmm 

 roseum, which affected so many of the Rhode Island Greening 

 apples during the fall of 1902. However, a microscopic exami- 

 nation at once showed that the fungus associated with the 

 decayed tissue of these apples was not C. roseum, but an entirely 

 different one. 



On account of this similarity to the decay caused by C. roseum 

 and the fact that the fungus found associated with the decay of 

 these apples seemed to be a very unusual one as a cause of fruit 

 decay, especially of decay of fruits in cold storage houses, it was 

 decided to make an investigation of it. 



Affected apples when first taken out of storage, had the appear- 

 ance shown in Plate III, Fig. i. The fruit was marked with 

 brown, sunken, decayed spots of various sizes up to an inch in 

 diameter, circular in outline except where several had coalesced. 

 The epidermis was often ruptured. After an affected apple had 

 been left in a moist chamber for a few days, an abundance of a 

 dirty-white, cob-web-like mold would make its appearance on 

 each decayed spot (Plate III, Fig. 2). 



Examination of the center of these decayed spots showed in 

 each case the presence of apple scab, Fusicladium dcndriticiim, 

 making it appear that the fungus causing the rot had gained an 

 entrance through the rupture made by the growth of the scab. It 

 was noticeable that the rot did not develop under the large spots 

 that seemed to have corked over, but upon the fresh and appar- 

 ently young ones that were evidently formed late in the season. 



In a comparison of the " Pink Rot " of apples caused by the 



lEustace, H. J. A Destructive Apple Rot Following Scab. N. Y Agr. Exp. 

 Station Bui. 227. D. 1902. 



