38 A PLA^T-PISZASE STTEVZY JM TEKA& 



Soot-rot (O&ordwm mnmvorum Shear). — This trouble caused the 

 death of a large portion of a plat of snap beans in a truck garden 

 in a single locality. Black-eyed peas occupied an adjacent plat, and 

 the lisease affected portions of both, beginn::;^ at the end and ad- 

 vancing to form a listinct semicircular area, al rat half of the senri- 

 .:: :a being occupied by each species 



Spe-jizir- cvl>:-:ed: Uvalde. 1944. 



Hoot-rot (Rrdzocioma sp.). — A few plants >f ^frijole 55 beans in 



an irrigated field were affected with this disease. 



Specimen collected: On Brack rancli, 30 miles west of CotnUa, 21-7. 



Bust \Vromyces appeiidiculatus (P.) Lk. . — This lisease — as ob- 

 served in an irrigated truck garden, and alsc in the University garden 

 at Austin. The maximum levelopment of the trouble was not 

 reached till after most of the rof had been harvested, bo that only 



small amount of loss resulted. 



Specimens collected: Uvalde 1947, 19IS .-. -Tin, 3129. 



BEET. 



leaf-spot [€ 'tr-cospora hetkola Sacc). — The presence of the sub- 

 sircular, Iry. " Hid blotches on the leaves of the beet Beta vulgaris 

 L. was very sommonly observed. The lisease was not, however, 

 sufficiently abundant to cause a great mount of injury. 



Specimens collected : Austin, 369, 1322, 1429, 3042; San Antonio, 1376, :-:"": 

 Mew Braunfete 1716; Sabmal, 1967; Georgetown, 2366. 



Boot-knot (Heterodera radicicola (Greef) MiiL). — This trouble 

 was quite common, especially .:. irrigated gardens e lovr moist 

 ground, but was not —nous. 



Specimens collected: Austin, 318 ~ ; San Anton! . 3148 



CABBAGE. 



Leaf-spot [Oercospara oloxami B. and Br. j \ . — Hie fungus 

 which is the cause of this leaf-spot on the sal :: age B ; : ' oleracea 

 \ vitat L. produces pale, snbcircnlar areas 1 to a mm. in liameter 

 surrounded hy a slightly raised, faintly purple ': urder. Conidial tofts 

 . mpbigenonss eat- : AApicuous in the center of the spots. Conidio- 

 phores densely tufted, pale brown, sparingly septate, 60 to ISO by 

 - :: -.■_• .... CoEiIia long-clavate. tapering, straight :i much :::a:'. 

 hyaline :r faintly smoky, many septate. 3 to 5 by 100 to 270 fx. Our 

 specimens are somewhat doubtfully referred to this species, since the 

 published lescriptions include no information concerning size of 

 i-onidiophores or spores, and the original specimens sh wed no 



223 



