464 Report op the Mycologist op the 



mentioned in works on plant diseases and in horticultural jour- 

 nals, but in no part of Europe has it been so destructive and so 

 much feared as it has been in the United States during the few 

 years of its presence here. 



In the United States its distribution is as wide as that of the 

 carnation itself. However, it is more common and more trouble- 

 some in the States lying east of the Alleghanies than in the 

 interior of the continent. There are two reasons for this: — (1) 

 the climate of the Eastern States is more moist; (2) carnation 

 growers are more numerous and located closer together. It is 

 not uncommon to find three or more carnationists in the same 

 village. Such proximity makes it easy for spores to be carried 

 by wind from one field to another. 



A very few growers are entirely free from rust. I have person- 

 ally visited a good many greenhouses on Long Island but I have 

 been in only one which was wholly free from rust. That par- 

 ticular house was kept so dry and at such a low temperature 

 that the plants themselves could barely exist. Some find rust 

 exceedingly troublesome, being obliged to throw out entire 

 houses of certain varieties; others, although never entirely ex- 

 empt from rust, have no trouble with it and do not consider it 

 as bad as the spot {8eptoria Dianthi), bacteriosis or even stem-rot 

 {Yolutella Dianthi?). The majority still consider rust one of the 

 most serious enemies to carnation culture, but it is not dreaded 

 nearly so much as it was three years ago. During the winter of 

 1892-93 the rust scare amounted almost to a panic. As an indi- 

 cation of the interest taken in the matter at that time it is an 

 interesting fact that three lengthy papers* on carnation diseases 

 were presented to the American Carnation Society at its meeting 

 held in Pittsburg, Pa., Feb. 21-22, 1893. 



Some Popular Errors Regarding Rust. 

 The life history and microscopic characters have been so ably 

 treated by Profs. Halsted, Arthur and Atkinson in the annual 



* Halsted, B. D., Diseases of the Carnation other than Rust: Atkinson, Ceo. F., Carnation 

 Diseases; Ward, C. W., Carnation Enemies and Supposed Remedies. 



