174 MILDE^V ON THE ROSE. 



MILDEW ON THE ROSE. 



Under artificial culture, this disease is frequently 

 observed, or, as some writers term it, the effects of 

 tlie disease j very few agree as to its origin or character. 

 From our observation it appears to be most common 

 v/here extremes of temperature prevail; even in the 

 open air this is plainly seen; in July or August, we 

 occasionally have a few cold nights, succeeded by 

 rain and warm weather, and as certainly as that kind 

 of weather occurs, as certainly does the mildew follow. 

 It is rarely seen in our collection of roses, few of 

 which are kept in high temperatures, and when it 

 appears, a few syringings of sulphur water are ap- 

 plied, which destroys jt. We prepare sulphur water, 

 by placing in a small barrel a piece of unslaked 

 lime, about the size of a double fist, with five or six 

 pounds of flowers of sulphur, on which we pour a 

 few gallons of boiling water, cohering it up for an 

 hour, when we stir it, till the whole of the sulphur 

 has fallen to the bottom. After settling, we pour off 

 the water for use, putting about a quart of it to the 

 gallon for syringing. A recent writer says, he uses 

 one ounce of nitre to one gallon of water, with whicii 

 he syringes the plants once In ten days, and finds it 

 an effectual cure. 



