82 A PLANT-DISEASE SURVEY IN TEXAS. 



fully referred to U. circinata. Salmon records it for species of 

 Acer only. 



Specimens collected : Austin, 315, 441. 



WILLOW. 



Leaf -spot (Cercospora salicina Ell. and Ev.). — Dark-brown, irregu- 

 lar, more or less confluent areas from 3 to 8 mm. in diameter are 

 present on the leaves of the willow (Salix sp.). The greater part 

 of the leaf becomes involved. 



Specimens collected: New Braunfels, 1724; Victoria, 2530; Falfurrias, 2462; 

 Floresville, 2856. 



Rust (Melampsora higelowii Thm.). — The yellow sori appear on 

 the foliage, upon the under surface of the leaves. 

 Specimens collected : Austin, 83, 237. 



WISTARIA. 



Leaf -spot (Phyllosticta wistariae Sacc). — This fungus on the wis- 

 taria {Krau7ihia sp.) causes circular grayish or brown spots 2 to 5 

 mm. in diameter, with a narrow purple border. Pycnidia are not 

 abundant, and on some of the spots a species of Alternaria is present. 

 Affected leaves showed considerable chlorosis. 



Specimen collected : Austin, 1304. 



DISEASES OF ORNAMENTAL PLANTS. 

 BALSAM-APPLE. 



Leaf -blight (Ramularia momordicae Heald and Wolf, 32). — In the 

 early stages of this disease the leaves of the balsam-apple (Momor- 

 dica halsamina L.) show irregular blotches of yellow. As the disease 

 advances, circular to subcircular yellowish-brown areas, varying 

 from 1 to 10 mm. in diameter, with a more or less evident zonation, 

 are formed on the upper side of the leaf. On the lower surface these 

 areas become depressed with a ridged margin and are dark brown in 

 color, due to the abundance of conidiophores and conidia. The 

 conidiophores, aggregated in tufts of 8 to 14, are 30 to 45 by 4 to 5 /a 

 in size and brown in color. The spores are cylindrical, hyaline, 42 to 

 65 by 4 to 5 /*, and 1 to 5 septate. (PI. V, fig. 1.) The spots are 

 often so numerous as to be confluent, causing the leaves to curl and 

 become dry. Much defoliation results. 



Specimen collected: Falfurrias, 2482 (type specimen). 



BEGONIA. 



Bacterial leaf -spot {Bacillus pyrocyanus P. and D.) ( ?). — The first 

 appearance of this trouble on the leaves of the begonia (Begonia sp.) 



226 



