Family Leguminosse 269 



Leaf Blotch 



Caused by Cercospora canescens E. and M. 



This disease, so far as is known, is not generally 

 distributed. It is found in certain trucking centers 

 in Texas. On the leaves the spots are circular, but 

 somewhat angular. The center of the spots is gray 

 with a reddish brown border, the outside of which 

 divides the diseased from the healthy tissue. The 

 conidiophores are equally abundant on both surfaces, 

 the spores are hyaline, straight or curved, slender and 

 one to many septate. While no experiments have 

 been made on the disease, spraying with Bordeaux 

 is recommended. 



Leaf Spot 



Caused by Isariopsis griseola Sacc. 



The disease is confined to the foliage only. The 

 spots produced are small and angular with no 

 colored borders (fig. 47 h, i). On the under side 

 of the leaf, the fungus forms a gray moldy growth 

 on the spot, where large numbers of the spores 

 are produced. The disease is not widely dis- 

 tributed, and may be controlled by spraying with 

 Bordeaux. 



Root Rot, see Rhizoctonia, p. 45. 



Texas Root Rot, see Sweet Potato, p. 175. 



Root Knot (fig. 49 b), see Nematode, p. 49. 



