DISEASES OF FORAGE CROPS. 49 



1 to 2 cm. in diameter. The spots are most commonly isolated, but 

 they may become confluent and irregidar. With the abundant pro- 

 duction of conidiophores and conidia the areas become dirty ^ay in 

 color. It causes a serious defoliation of the plants. It was originally 

 described from Java (41), and no mention has been found of its oc- 

 currence in this country. (PI. I, fig. 1.) 



Specimeus collected: Austin. 1543, 2428; Beeville, 1S26; Elgin, 1889, 2006; 

 Uvalde, 1946; Victoria, 2529; Nursery. 2549; Cuero, 2604; Gonzales, 2673; 

 Flatonia, 2730 ; Yoakum, 2767 ; Floresville, 2854 ; Hallettsville, 2902. 



Leaf -spot {Cercospora cruenta Sacc). — The large, indefinite, vague 

 spots which this fungus produces characterize the disease. The tissue 

 on the upper leaf surface is paler green or somewhat chlorotic, and 

 the profuse production of conidiophores and conidia on the lower 

 surface renders it dirty gray in color. The spots are largely con- 

 fluent, often involving the entire leaf and causing its destruction. 

 (PI. I, fig. 2.) 



Siiecimens collected: Beeville, 1860; Luling, 2259, 2260; Flatonia, 2729; 

 Yoakum, 2752 ; Austin, 3131. 



Root-rot {Ozoninm omnivorum Shear). — The symptomatology of 

 this disease is the same as that of the cotton root-rot. 



Specimens collected : Beeville, 1837 ; Uvalde, 1945. 



Rust {Uromyces apyendiculatus (P.) Lk.). — This trouble was ob- 

 served in only one locality where it was not the cause of any serious 

 loss. 



Specimen collected: Luling, 2260. 



PEANU?:'. 



■s . 



Leaf-spot {Cercospora personata (B. and C.) Ell.). — This disease 

 on the peanut {Arachis hypogaea L.) is so common on the mature 

 plants that farmers consider it time to harvest when the leaves are 

 badly spotted. The spots are chestnut brown, beginning as minute 

 specks and increasing to about 4 mm., often, however, to as large as 

 10 mm. The margin of the spot is yellowish, paling out into the 

 green of the leaf. The conidiophores are present on both surfaces, 

 being more abundant below. The conidia are frequently 100 /x in 

 length. In the original description (14) the fungus is said to be 

 hypophyllous and the conidia may reach a maximum of 50 fi. (PL 

 III, fig. 9.) . 



Specimens collected: Brenham, 1465; Elgin 2019; Luling, 2235; Nursery, 

 2566 ; Stockdale, 2624 ; Hallettsville, 2905. 



100833°— Bull. 226—12 4 



