New York Agricultural Experiment Station, 467 



ing to them said, " There is where nist comes from." The family 

 of rusts, Uredinew, is a large one. A great many weeds are 

 affected — ^some with two or more species of rust — but, so far 

 as known, none of them harbor the carnation rust, Uromyces 

 caryophyllinus. According to Dr. Winter* the host-plants of U. 

 caryophyllinus are Dianthus caryophyllus L, (Carnation), D. proli- 

 fer L. D. superbus L. and Gypsophila paniculata L. 



Fungicides Which Have Been Recommended for Rust. 



A perusal of the floricultural literature reveals the fact that 

 quite a variety of remedies have been recommended for carna- 

 tion rust. One would naturally expect that these recommenda- 

 tions, coming as they do for the most part from practical florists, 

 would point us at once to the proper method of combating rust. 

 But it is to be observed that the evidence is frequently contra- 

 dictory, some of it is pure theory and only in a few cases are the 

 recommendations for treatment based upon the results of prop- 

 erly conducted experiments. Let us briefly review the literature 

 of some of the fungicides recommended. 



Bordeaux mixture. — This is the leading fungicide. It has been 

 proven by experiment and in practice to be a specific for a long 

 list of fungous diseases. It is in general use for spraying vine- 

 yards, orchards and potato fields. When the destructive charac- 

 ter of carnation rust was brought to the attention of botanists 

 they unhesitatingly recommended the use of Bordeaux mixture 

 and gave the subject no further consideration. Florists who 

 tried it in practice reported from time to time in the columns of 

 the American Florist and Florists^ Exchange. Most of these re- 

 ports were favorable but some were unfavorable. It is not worth 

 while to consider them in detail because, with one exception, 

 the experiments were not made under test conditions. Those 

 who tried the Bordeaux mixture were so anxious to entirely 

 eradicate the disease from their premises that they did not take 

 the precaution to leave a few untreated plants with which they 

 might compare their treated plants in order to determine 



* Winter, G., Rabh. Kryptogamen Flora I., Abtheil I., p. 149. 



