Violets. 



193 



For several years the violet has been a prey to two 

 forms of disease which have nearly exterminated it in 

 some sections. One of these is caused by the same 

 worm which is making so much trouble among roses 

 in some sections. Violet root galls (See Fig. 39), Dr. 

 Halstead tells us, are identical with the lobes found in 

 rose roots. 



It would be well to adopt the same precautionary 

 measures for violets as were recommended for roses 

 when nematoids are 

 present in the soil. 



Carefully examine 

 the roots when the 

 plants are lifted in 

 the field, and reject 

 all that show any 

 indication of their 

 presence. 



The other form of 

 disease, known to 

 growers as leaf spot, 

 is due to a fungus, 

 so says the same au- 

 thority. Of these, 

 many forms exist, 



and several may be Fig. 39. 



present on the plant at the same time. 



jNIuch has been written in relation to this disease dur- 



