58 ROSES 



other things, attends those who give constant, 

 intelligent care to the many details. 



The mildews of the phlox and verbena 

 have been effectually controlled by spraying 

 with kerosene emulsion of the standard 

 strength for insects. This mildew is so 

 closely related to the one of the rose that 

 similar results may be expected with the rose 

 mildew. 



The Downy Mildew of the Rose. A second 

 form of mildew (Peronospora sparsa, Berk.) 

 is sometimes troublesome to rose growers. 

 This is a close relative of a similar one upon 

 the greenhouse lettuce, and another is often 

 destructive to spinach, while a third is the 

 cause of a soft rot of potatoes. It produces 

 downy or velvety patches upon the leaf, quite 

 unlike the form above described, and the 

 threads run through the substance of the 

 leaf. In this case the fungus will have vege- 

 tated for a considerable time before it appears 

 upon the surface, which is entirely for the pur- 

 pose of producing its multitude of spores 

 borne upon the tips of the many aerial 

 branches. 



It is evident that the sulphur fumes may 

 cause the destruction of the spores, but may 



