46 A PLANT-DISEASE SURVEY IN TEXAS. 



Each is bordered by a dark-brown or purplish zone beyond which is 

 an area of faint 3'ellow. The mature spots have grayish centers. 



Specimens collected: Hempstead, 1487; Beeville, 1816; Luling, 2245; Victoria, 

 2338; Alice, 2494; Nursery, 2545; Stockdale, 2634; Flatonia, 2733: Yoakum, 

 2764; Hallettsville, 2903. 



Sooty mold ( Capnodium ( ? ) ) . — The stems, petioles, and leaves 

 become covered over with a sooty, black coating, more abundant on 

 the older parts of the plant. On the late crop in some localities it 

 results in the death of the entire plant. Probably the injury is 

 mostly due to plant lice and the fungus is merely secondary. Dark- 

 brown pycnidia 90 to 120 /x are formed on the surface. The spores 

 are clear, elongated, 5 to 6 by 3 /u., and stream out in tortuous, rope- 

 like strands. 



Specimens collected : Elgin, 2000 ; Bastrop. 2048 ; Cotulla, 2202. 



DISEASES OF CEREALS. 

 BARLEY. 



Covered smut {Ustilago horclei (P.) Kellerm. and Swingle). — This 

 smut was present in considerable quantities in barley {Hordeum sp.) 

 grown near San Antonio in 1009.^ 



Loose smut {Ustilago niida (Jens.) Kellerm. and Swingle). — Bar- 

 ley is not grown as a field crop in the territory covered by this sur- 

 vey, and this material was collected from a plat on the University 

 campus. The brown spore masses occur on the spikelets, which fall 

 away, leaving only the naked rachilla. 



Specimens collected : Austin, 3099, 3118. 



Rust {Pu^dnia gra?nims P. var. hordei Freeman and Johnson). — 

 This rust was prevalent on barley near San Antonio in 1909.^ 



CORN. 



Rust {Puccmia sorghl S.). — This disease on corn {Zea mrnjs L.) is 

 quite general in its distribution but was not observed to be sufficiently 

 abundant to cause any serious loss except in one field of late com at 

 Flatonia. 



Specimens collected: Austin, 1557; Kerrville, 1584; Boerne. 1649; New 

 Braunfels, 1679; San Antonio, 1782; Elgin, 1893; San Marcos, 2102; Gonzales, 

 2676; Flatonia, 2719; Yoakum. 2751. 



Smut {Ustilago zeae (Beckm.) Ung.). — No loss of any consequence 

 can be attributed to smut, as it was rarely found in abundance. At 

 Uvalde a field of corn was observed which had 40 to 50 per cent of the 

 ears destroyed, but in all other localities smut was rare. 



Specimens collected: Austin, 1450; Kerrville. 1.583; New Braunfels. 1709; 

 Uvalde, 1962 ; Hondo, 1997 ; Cotulla, 2216 ; Seguin, 2299 ; Flatonia, 2720. 



1 Notes from E. C. Johnson, Bureau of Plant Industry, U. S. Dept. of Agriculture. 

 226 



