RUST, SMUT, ETC. 127 



County, New York, has estimated the number of plants of rust 

 on a single wheat stalk to be twenty millions. 



227. In a paper published by Professor Heuslow, in the 

 "Agricultural Journal" for 1841, on the "Specific Identity of 

 the Fungi producing Rust and Mildew," he endeavored to estab- 

 lish the position that rust, or uredo rubigo, is an immature or 

 imperfect form of another fungus, the puccinia graminis, or mil- 

 dew. The author of "Blights of the Wheat" (the Eev. Edwin 

 Sidney) says : "All that the author can, as yet, venture to as- 

 sert is, that some puccinia have clearly the appearance of uredo 

 before the septum or division of the spores into chambers is 

 fully developed." (See Figs. 1 and 2, page 113(a). The figure 

 by Corda confirms the opinion that Mr. Sidney's observation is 

 safe and accurate, as far as regards the British or European spe- 

 cies. I am rather inclined to suppose that the American rust is 

 distinct from the American species. I have often seen forms 

 very similar to those shown in figure 3, page 114(a). 



228. The following varieties of wheat have been recommended 

 as in part "rust proof:" 



1. VirginiaWhite May Wheat — resembles the white flint; ripens 

 six or eight days earlier than the white flint, and has not been 

 injured by rust.(i) It is said to have deteriorated by culture in 

 New York, in other words, it has become acclimated, and lost 

 some of the properties for which it was distinguished. Fresh 

 importations of seed are required. 



2. Pea wheat or Siberian v^heat "is not subject to rust," (2) 

 (spring wheat.) 



3. Black Sea wheat ; (spring wheat ;) well known in Canada, 

 and although much deteriorated, still supposed to possess certain 

 immunity from rust. 



(1) Emmons' Nat. His. of New York,— Agrriculture. 



(2) Vide Emmons as before. 



