56 ROSES 



they started into vigorous growth at those 

 places where the proper conditions were 

 supplied. 



The superficial nature of the mildew is of 

 great importance when the matter of remedies 

 is considered. It is a fungus that is in the 

 air, as it may be termed, in contrast with most 

 of the rose diseases that when active are 

 deeply seated in the plant. The spores are 

 produced as minute delicate cells upon 

 upright filaments that arise from the web 

 of horizontal vegetative hyphae. They are 

 easily reached by fungicides and apparently 

 destroyed without difficulty. Any of the 

 ordinary sprays will answer for the mildew, 

 but even these need not be resorted to, pro- 

 vided spraying is uncalled for by the presence 

 of other rose fungi. In short, if the mildew 

 is the only enemy at hand, it may be kept in 

 check by the use of flowers of sulphur, either 

 dusted upon the plants or even the pipes of 

 the greenhouse, the point being to produce a 

 gentle fumigation of the plants and the whole 

 house with the fumes of the sulphur. Profes- 

 sor Maynard, of the Massachusetts Experi- 

 ment Station, finds that a small kerosene stove 

 is most convenient for this purpose, and the 



