INSECTS AND DISEASES 327 



on the leaves. Apply ammoniacal carbonate of 

 copper or Bordeaux. 



Rose Leaf-blight ' (black spots) — Makes its 

 appeamnce first in the form of small black 

 spots on the full-grown leaves but rapidly 

 spreads over the entire surface. Spray with 

 Bordeaux or ammoniacal carbonate of copper, 

 applied before leaves unfold. 



Rust — Attacks carnations producing gray 

 blisters on the leaves, the spots eventually 

 bursting. Spray with Bordeaux. 



Verbena Rust — ^Whitish, mildew-like disease 

 attacking the leaves and usually killing the 

 plants. Spray with sulphide of potassium 

 every four or five days. 



FUNGICIDES 



Sulphate of Potassium-^TJse at the rate of 

 one-fourth to one ounce in a gallon of water. 



Ammoniacal Carbonate of Copper — Dissolve 

 one ounce of copper carbonate in one-half pint 

 of ammonia diluted with two quarts of water, 

 and dilute to ten gallons of water. 



Bordeaux Mixture — In a wooden or earthen 

 vessel containing four to six gallons of water 

 dissolve six pounds of copper sulphate by sus- 

 pending it in a bag made of coarse cloth. When 



