Family Leguminosae 273 



pea Fusarium is parasitic only on the cowpea, and 

 so far as is known does not attack any of the other 

 cultivated legumes. 



Control. Diseased fields may be sown with beans 

 or any other legume except cowpeas. Crops other 

 than legumes may also be grown there. The develop- 

 ment of resistant varieties is also a promising method 

 of control. Orton 1 has already developed the Iron 

 cowpea (fig. 50 d), a variety which is resistant to wilt 

 and partly also to Nematode. 



Root Rot, see Rhizoctonia, p. 45. 



Texas Root Rot (fig. 50 b), see Okra, p. 175. 



Root Knot (fig. 50 c), see Nematode, p. 49. 



DISEASES OF THE GARDEN PEA {Pisum 



sativum) 



Like the bean and cowpea, the garden pea is sub- 

 ject to numerous diseases, some of which are of great 

 economic importance. However many of these dis- 

 eases may be controlled. 



Stem Blight 



Caused by Pseudomonas pisi Sack. 



Blight is a new disease recently found by Sackett 2 

 in the pea fields of Colorado. So far as is known, the 



1 Orton, W. A., U. S. Dept. of Agr. Bur. PI. Ind. Bui. 17 : 9-36, 

 1902. 



2 Sackett, W. G., Colorado Agr. Expt. Sta. Bui. 218 : 3-43, 1916. 



r8 



