96 DISEASES OF ECONOMIC PLANTS 



appearance Volutellose is not to be distinguished from 

 Spliseropsose, though the texture of the rotted tissue is 

 much firmer and dryer. Under the hand lens the sporif- 

 erous pustules are seen to be clothed with numerous hairs, 

 which character sufficiently marks it as a separate disease. 

 As yet it has been reported only from North Carolina.' 



New Hampshire fruit spot (Cylindrosporium pomi 

 Brooks). — This disease, which has been noted in Delaware, 

 New York, Pennsylvania, Michigan, Maine, Massachusetts, 

 New Hampshire, Toronto, and Montreal, appears in late 

 summer as very small, deep red, slow-growing spots, usually 

 at the lenticels. A little later these spots turn brown and 

 then resemble closely the young spot of black rot or ripe 

 rot in appearance though not in texture. At or after 

 harvest the spots are somewhat depressed, through failure 

 of the sick tissue to keep pace in growth with the surround- 

 ing tissue. This disease has been demonstrated by Brooks - 

 to l)e of fungous origin and to be amenable to treatment by 

 the Bordeaux mixture applied late in June or early in July. 



Black mold (Alternaria sp.). — The blossom end of the 

 fruit is affected by the rot. The spot is dark purplish 

 to brown and slightly sunken, enlarges very slowly, and 

 may not be noticeable until the fruit is in storage. 

 Often no disease is noted until the apple is cut through, 

 when the core is found blackened and discolored, and 

 the seeds covered with the dark mycelium. In more 

 serious cases the effect extends into the surrounding pulp. 

 This black mold was first described by Longyear.^ 



1 Stevens, F. L., and Hall, J. G., N.C. Agr. Exp. Sta. Bui. 196, p. 41. 



2 Brooks, Charles, N.H. Agr. Exp. Sta. Rpt. 19, 1908. 



3 Longyear, B. O., Colo. Agr. Exp. Sta. Bui. 10.5, 1905. 



