228 MANUAL OF FRUIT DISEASES 



passed. In the spring the teliospores germinate by means of a 

 short promycelium bearing sporidia. The sporidia are blown 

 to the currant and gooseberry, where infection occurs. Finally, 

 the secial cups appear; these bear a fringed margin and are 

 filled with small seciospores. 



Control. 



Usually this rust disease does not cause damage sufficient 

 to warrant particular attention. If it should assume serious 

 proportions, the elimination of rusted sedges in the fall would be 

 essential. No further control measures are known. 



REFERENCES ON CLUSTER-CUP RUST 



Humphrey, J. E. The cluster cup of the gooseberry (^Ecidium 



Grossulariae Schum.). Massachusetts State Agr. Exp. Sta. Rept. 



1892 : 33-34. 1893. 

 Longyear, B. O. Fungous diseases of fruits in Michigan. Gooseberry 



rust. Michigan Agr. Exp. Sta. Spec. Bui. 25 : 48. 1904. 

 Anonymous. Gooseberry cluster^cup disease. London Bd. Agr. 



Journ. 14 : 428-429. 1907. 

 Soppitt, H. T. The gooseberry fungus. Gard. Chron. 3 : 24 : 145. 



ARMILLARIA ROOT-ROT 

 Caused by Armillaria mellea (Fries) Quel. 



The gooseberry, among several other fruits, is at times badly 

 injured or killed by Armillaria mellea in the state of Washing- 

 ton. The disease probably occurs elsewhere on the gooseberry, 

 although it has not been so reported. Its importance on tree- 

 fruits gives it a prominent place in the realm of plant diseases. 

 The symptoms, cause and control as discussed under Apple 

 (page 96) are applicable for the most part to the gooseberry. 



