RED RUST 285 



This book can add little to what is already known 

 concerning the numerous fungous enemies of bush- 

 fruits. The aim of the present chapter is to present 

 in brief form the more important facts known about 

 those which prove most serious, together with a few 

 of the most accessible references to what has been 

 written concerning them. 



THE IMPORTANT FUNGOUS DISEASES 

 RED RUST, YELLOWS 



Puccinia interstitialis (Schlecht.) Tranzschel, Hedwigia, 1893:257. 



Cceoma inter stitiale, Schlecht. Mddium, nitens, Schw. Cceoma (jEcidium) 

 luminatum, Link. Uredo interstitialis, Schlecht. Uredo lucida, Dietr. 

 Puccinia Peckiana, Howe, Rep. N. Y. Mus. 23: 57. Puccinia tripustu- 

 lata, Peck, Rep. N. Y. Mus. 24: 91. 



Order Uredinere. 



Saccardo, Syll. Fung. 7: 699, 866 and 9: 331. Burrill, Par. Fung. 111. 178, 

 220. Newcombe, Jour. Myc. 6: 106. Clinton, Bull. 111. Exp. Sta. 29: 

 273-300. 



On leaves of Bubus nigrobaccus (villosus), B. villosus (Cana- 

 densis), E. occidentalis, B. cuneifolius, B. strigosus, B. triflorus, 

 B. trivialis, B. hispidus, B. saxatilis and B. arcticus. 



This fungus was first described by Schlechtendal in 1820 as 

 Cceoma interstitiale. The relationship between the mature and 

 immature forms was independently established by Tranzsehel in 

 Germany, and by Clinton in the United States, in 1893. 



The appearance of this disease is well known, both on wild 

 and cultivated plants. The orange -red color of the under surface 

 of the infested leaves is due to the abundance of sori, which 

 produce the orange -red spores by means of which the disease 

 may be spread from plant to plant. These are connected in 

 chains, and form a waxy layer over the affected portions. The 

 mycelium of the fungus, which corresponds to the roots of 

 higher plants, is perennial, living throughout the winter in the 

 canes and roots, and a plant once attacked is doomed. Its 

 vitality is sapped, and its condition is soon manifest by the 

 numerous small, weak canes which spring up. 



