178 DISEASES AND INSECT ENEMIES. 



flowers to be reduced. This only emphasizes the 

 statement already made, that diseases are largely 

 the result of improper methods of culture, and 

 the overlooking of important facts in regard to 

 handling the plants. 



Scald, or Edge Burn, This disease as a rule 

 is not serious, although under certain conditions it 

 may become quite troublesome and materially 

 affect the yield of flowers. It manifests itself 

 first by the edges of the leaves turning a yellowish 



53. Edge burn, brought on by cold soil. 



green. A few days later this color may gradually 

 fade out to almost white, and eventually the en- 

 tire edge of the leaf will become a papery whitish 

 color. The trouble is usually confined to a rim 

 running around the outer edge of the leaf. This 

 rim varies in width from one-sixteenth to one- 



