MAINE AGRICULTURAL EXPERIMENT STATION. I910. 397 



Several spots may coalesce and form irregular patches, some- 

 times covering a large portion of the apple. In severe attacks, 

 especially those resulting from early infections when the fruit 

 is small, the apples often become cracked and badly distorted 

 in shape due to the unequal growth of the healthy and diseased 

 portions. Fig. 64 represents an apple in this condition. 



\\'hile scab on the fruit is largely a superficial growth, the in- 

 jury it does directly and indirectly is by no means confined to 

 simple damaging of the appearance of the fruit. As is pointed 

 out elsewhere in this publication (p. 407) epidemics of pink rot 

 and some of the blue mold decay come from secondary infections 

 of these fungi through scab spots. Scabby apples in addition 

 to being more likely to decay wither more rapidly in storage than 

 do perfect apples. 



In a former publication of this Station attention was called 

 to what then appeared to be a rather novel and uncommon form 

 of the development of scab on apple fruit — its appearance and 

 growth on apples in storage cellars.* Since the publication of 

 this article certain more or less general statements have been 

 found in the early Station literature indicating that somewhat 

 the same thing had been noted and recorded at least 20 years 

 before.** From information collected since publishing the ac- 

 count above referred to, it would seem that the appearance and 

 spread of apple scab in storage is by no means uncommon in 

 eastern states but in the past it has been largely overlooked. 



Apple scab in storage may develop on fruit which, when placed 

 in the cellar, appeared entirely free from the disease. It differs 

 in appearance from the spots formed out-of-doors so much that 

 at first one is doubtful as to the identity of the two diseases. 

 Cultures made from the storage developed spots settled this point 

 beyond doubt. Instead of soon breaking out and producing 

 olive-colored summer spores the fungus usually remains be- 

 neath the unruptured cuticle, and the diseased portions appear 

 as slightly sunken, small, black, somewhat shiny spots. As ob- 

 served in Maine these storage developed spots have always been 

 much smaller than those produced out-of-doors. Many of them 



*Morse. W. J. Me. Exp. Sta. Bui. 164, p. 4, 1909- 

 ** Garman, H. Ky. Exp. Sta. Rep. 2, p. 48, 1889. 

 ^IcCarthy, Gerald. N. C. Exp. Sta. Bui. 92, p. 88, 1893. 

 Henderson, L. F. Idaho Exp. Sta. Bui. 20. p. 83, 1899. 



