PROTOBASIDIOMYCETES 



403 



X. ASPARAGUS RUST 

 Puccinia Asparagi De C. 



HALSTED, B. D. The Asparagus Rust; Its Treatment and Natural Enemies. 



N. J. Agl. Exp. Sta. Built. 129: 1-20. pi. 1-2. 1898. 

 HALSTED, B. D. Experiments with Asparagus Rust. N. J. Agl. Exp. Sta. 



Kept. 11: 343-347- 1898. 

 SIRRIXE, F. A. Spraying for Asparagus Rust. N. Y. Agl. Exp. Sta. Built. 



188: 122-166. 1900. 

 SMITH, RALPH E. The Water-Relation of Puccinia Asparagi. Bot. Gaz. 38 : 



19-43. figs. 1-2 1. 1904. 

 SMITH, RALPH E. Further Experience in Asparagus Rust Control. Calif. Agl. 



Exp. Sta. Built. 172 : 1-22. 1906. 

 SMITH, RALPH E. Asparagus and Asparagus Rust in California. Calif. Agl. 



Exp. Sta. Built. 165: 1-95. Jigs. 1-45. 1905. 

 STONE, G. E., and SMITH, R. E. The Asparagus Rust in Massachusetts. Mass. 



(Hatch) Agl. Exp. Sta. Built. 61 : 1-20. 1899. 



Distribution and general 

 effects. The fungus caus- 

 ing asparagus rust was de- 

 scribed a century ago, and 

 the effects of this fungus 

 upon the asparagus plant 

 have been known perhaps 

 almost as long by growers 

 in Europe. It has been, 

 however, in general of 

 no great consequence as 

 an asparagus disease; but 

 upon making its appear- 

 ance in America, some- 

 what more than twelve 

 years ago, this rust began, 

 under our conditions, im- 

 mediately to assume an 

 unexpected importance. 

 In a brief space of time 

 the asparagus-growing 

 interests of the country were seriously threatened. According 

 to Halsted, who followed closely its early spread in this country, 

 it became in 1896 a serious pest in New Jersey, Delaware, 



FIG. 198. PUCCINIA ASPARAGI: RUST OF 

 ASPARAGUS 



