438 BUSH-FRUITS 



CURRANT LEAF -SPOT (Fig. 79) 



Septoria RiUs, Desm. Order Spheeropsideae. Family Sphserio- 

 idese. 



Saccardo, Syll. Fung., 3 :491. Peck, Rep. N. Y. Mus., 38 :97. Martin, 

 Jour. Myc., 3 :73. Pammel, Bulls. Iowa Exp. Sta., 13 :45, 67. 

 17 : 420. 30 :289. 



On Ribes rubrum and R. nigrum. 



This disease produces a brown spotted appearance of the 

 leaves, followed by their premature fall. 



Professor Pammel 's experiments at the Iowa Experiment Sta- 

 tion have demonstrated conclusively that it can be controlled and 

 the foliage retained by thorough spraying with Bordeaux mixture. 

 Five sprayings, beginning May 10 and ending July 22, proved 

 wholly effective. 



Cercospora angulata, Wint. Order Hyphomycetese. Family 

 DematieaB. 



Saccardo, Syll. Fung., 4 : 459. Winter, Jour. Myc., 1 : 124. Pammel, Bull, 

 la. Exp. Sta.. 13 : 45. 17 : 420. 



Professor Pammel reports this species on both red and black 

 currants, associated with Septoria Ribis, and yielding to the same 

 treatment. 



GOOSEBERRY CLUSTER-CUP 



Mtidium grossularice, Schum. Order Uredinese. 



Sacc. Syll. Fung.,7 :792. Humphrey, Rep. Mass. Exp. Sta., 10 (1892) :241. 



On leaves and fruit of Ribes grossularice, R. rubrum, R. alpi- 

 num, R. nigrum, R. aureum and R. rotundifolium. 



This disease varies much in frequency. Ordinarily it causes no 

 damage, but occasionally seems to develop with unusual rapidity, 

 and work serious injury. It is difficult to combat, for when the 

 cluster-cups appear so that the disease is noticed, the harm for 

 that year is already done. Picking off and destroying the in- 

 fected leaves will tend to prevent damage the succeeding year, 

 but this is hardly necessary and seldom practicable. Perhaps 

 spraying for the gooseberry mildew may prevent the earliest 

 infection. 



