CURRANT DISEASES 207 



affected. Although both red and white currants are susceptible 

 to anthracnose, some differences in resistance are noticeable. 

 It has been observed that the Albert variety is resistant and 

 the Fay and Victoria, growing in close proximity to the Albert, 

 may be seriously affected. Again, the White Grape and Wilder 

 are susceptible, while the Moore Ruby and Perfection varieties 

 are resistant. 

 Symptoms. 



The disease is primarily a leaf-trouble (Fig. 54), although it 

 also shows on the petioles, young canes, fruit-stalks and fruits. 



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FIG. 54. Currant-anthracnose lesions on leaves. 



The attack is made first on the older leaves, and as a result they 

 become thickly dotted with small dark brown, circular spots, 

 chiefly on the upper surface (Fig. 54). When the trouble 

 assumes large proportions, the leaves turn yellow and fall 

 prematurely. On the berries the spots are small, resembling 

 fly-specks. On the fruit-stalks, the lesions are larger and. may 

 be one-fourth to one-half an inch in length and may extend half- 

 way around the stem. On the leaf-petioles, conspicuous, 

 black, slightly sunken spots are formed. The anthracuose is 

 sometimes confused with leaf -spot (see page 203), but can readily 

 be distinguished from it by the smaller size of the spots. 



