FUNGI IMPERFECTI 299 



XI. PEACH AND APRICOT SCAB 



Cladosporium carpophilum Thiim. 



Arthur, J. C. Spotting of Peaches. Ind. Agl. Exp. Sta. Built. 19: 1-8. 



figs. 1-3. 1889. 

 Chester, F. D. Peach Scab. Del. Agl. Exp. Sta. Rept. 8 : 60-63. l8 9 6 - 



Fig. 133. Peach Scab on White-fleshed Fruit 



This fungus is responsible for the well-known peach scab, a 

 disease common throughout the country on peaches, and also on 

 apricots. It forms, as a rule, numerous 

 small, circular, sooty spots, sometimes 

 confined to one portion of the fruit and 

 at other times scattered over the whole 

 surface. It is so common upon the 

 poorer grade of market fruit that dur- 

 ing an ordinary season practically none 

 of the second or third quality fruit, es- 

 pecially that with white pulp, is free 

 from it. The spots may become scabby 

 in form, and coalesced into large irreg- 

 ular areas, and as a result of the injury 

 severe cracking of the fruit may occur 

 (Fig. 133). Twigs and leaves may also 

 become affected. On the latter distinct 

 spots are produced, often accompanied 

 by the falling out of the affected areas, 

 as with many other fungi, thus leaving 

 a shot-hole effect. On the twigs the 



Fig. 134. Cladosporium 

 carpophilum 



