338 GREENHOUSE MANAGEMENT. 



what he considered to be the cause. From the fact that 

 lie found bacteria present it was thought to be of a 

 bacterial nature, and the name " Bacteriosis " was 

 given it, 



The Division of Pathology of the National Depart- 

 ment of Agriculture has recently proven that the bacte- 

 ria are but a secondary cause of the disease, and that it 

 Trill not appear if the plants are kept free from the 

 .attacks of aphides, thrips, and other insects through 

 whose punctures the bacterial germs gain entrance. 



FUNGOUS AND OTHER DISEASES OF VIOLETS. 



The following notes were kindly prepared by Prof. Byron 

 D. Halsted, of the New Jersey Experiment Station, 

 who is an authority on the subject. 



At the outset it may be said that there are more 

 enemies to violets than most practical growers are at 

 first willing to admit. Much has been published upon 

 the general subject in the florists' journals and quite 

 uniformly under the title of — The Violet Disease. 

 There are enemies of all sorts and frequently the worst is 

 man himself. In other words, lack of proper treatment 

 of soil, of the watering can, of ventilation, of tempera- 

 ture, exposure to gases, cold winds, and many other things, 

 can be charged with much of the hick of vigor of the 

 plants and failure to produce profitable amounts of 

 blooms. It is, however, not our purpose to treat of these 

 things. There are several species of fungi that alone, 

 or two or more working together, do much to destroy 

 the crop. These will be briefly treated below, and it is 

 hoped that light will be thrown upon the obscure sub- 

 ject that may possibly assist in the difficult labor of 

 finding remedies that will check their ravages. 



the violet leaf spot (Cercospora Violm, Sacc). 



This is one of the most conspicuous as well as com- 

 mon of the fungous diseases of the violet. As its nam« 



