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 cial cups appear; these bear a fringed margin and are 
filled with small zciospores. 
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 (Atcidium 
Grossularis Schum.). Massachusetts State Agr. Exp. Sta. Rept. 
1892 : 33-34. 1898. 
Longyear, B.O. Fungous diseases of fruits in Michigan. Gooseberry 
rust. Michigan Agr. Exp. Sta. Spec. Bul. 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. 
1898. 
ARMILLARIA Root-Rotr 
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. 
