310 



DISEASES OF ECONOMIC PLANTS 



As to means of dissemination and control, what is said 



under soil diseases will apply. 



Leaf mold {Cladosporium fulvum Cke.). — Under glass 



in the North and occa- 

 sionally in the open, 

 especially in the South, 

 this disease is destruc- 

 tive. It occurs as 

 rusty or cinnamon- 

 ])rown blotches on the 

 lower side of the leaf, 

 which turns yellow 

 above, then l^rown or 

 black, curls, and dies. 

 The loss of food sup- 

 ply consumed l)y the 

 parasite together with 

 the loss through de- 

 struction of the leaf 

 green injures the yield 

 seriously. 



Indoors, ventilation 

 is the best remedy, 

 coupled with clean cul- 

 ture to avoid carrying 

 the pest over to an- 

 other year. On fields 



Bordeaux mixture would doubtless serve well. 



The causal fungus of this disease was first described in 



1883 by Cooke from specimens collected in North CaroUna. 

 Leaf spot (Septoria Lycopersici Speg.). — A very com- 



- Tomato leaf showing spots (sep- 

 toriose). Original. 



