OUTDOOR ROSE GROWING 



"When the experienced rose grower observes orange-yellow 

 spots on the leaves of his plants in early summer, he knows that 

 he sees the advance guard of the fungoid disease known vari- 

 ously as orange fungus and red rust. 



"Some suppose these to be separate diseases; on the contrary 

 they are separate stages in the triune life-cycle of disease, 

 Phragmidium subcorlicatum. The first, or dEcidium, stage gives 

 the orange fungus; the second, or Uredo, stage gives the red 

 rust; the third, or Teleuto, stage gives a black rust. 

 "Where the orange fungus has obtained a strong hold, and has 

 caused trouble for several successive years, it cannot be exter- 

 minated at a single attempt. Repeated attacks on it must be 

 made. Measures may begin by spraying the bushes thoroughly 

 in the spring, before growth starts, with Bordeaux mixture. 

 "Bordeaux Mixture. To prepare Bordeaux mixture take 

 2^4 lb. of sulphate of copper (bluestone), dissolve in a little hot 

 water; 23^ lb. of freshly burned lime, dissolve in cold water; 

 1 lb. of agricultural treacle, 1 lb. of soft soap. Pour together 

 when cool; stir the treacle or soft soap well in and make up to 

 twenty-five gallons with water. 



"When the first signs of the disease appear in summer, spray 

 with carbam, repeating if necessary. The solution should 

 reach the under as well as the upper side of the leaves. 

 "To prepare carbam, take 1 ounce of carbonate of copper, 

 J^ pint of liquid ammonia. Dissolve the carbonate of copper 

 in the ammonia and mix with ten gallons of water." 



One point that all authorities seem to agree upon 

 is the picking and burning of all dead and fallen 

 leaves affected by black spot. 



