VEGETABLE AND FIELD CROPS 259 



destructive. Twenty per cent injury has been reported 

 from Ohio; 33 per cent from some parts of Nebraska. 

 The fungus hibernates in seed derived from affected pods. 

 Such seed should not be used for planting. Liver of 

 sulphur or Bordeaux mixture is effective in the field. 



Damping off. See p. 60. 



Rust. See bean. 



Leaf spot, septoriose (Septoria Pisi Westd.). — This 

 disease cannot well be distinguished from ascochytose 

 without the use of the microscope. 



Pleosporose (Pleospora Pisi (Sow.) Fckl.). — Frequently 

 moldy black spots are noted upon pea pods, leaves, or other 

 parts. This condition is chiefly a secondary disease follow- 

 ing injury by some other disease. 



Rhizoctoniose. See p. 61. 



PEANUT 



Leaf spot, cercosporose {Cercospora personata (B. & C.) 

 Ell.). — This leaf spot is circular in outline, indefinitely 

 bordered, black to brown in the center and grading to 

 green on its outer edge. The lower leaves are first 

 affected and suffer most; later the disease spreads to 

 upper leaves. The leaves begin to fall soon after they 

 spot, and in many cases the death of the plant results. It 

 is often a pest. 



The fungus causing this disease was first collected in 

 Carolina and Alabama by Ravenel. 



PEPPER 



Southern blight, wilt (SclerotiumRolfsii Sacc. in litt.). — 

 The blight shows itself first as a slight drooping of the 



