12 



A PLANT-DISEASE SURVEY IN TEXAS. 



have been placed in the herbarium of pathological collections, Bureau 

 of Plant Industry, Washington, D. C. New species have been de- 

 scribed as such in different numbers of Mycologia. 



TERRITORY COVERED BY THE SURVEY. 



The territory covered by this survey is included within a circle 

 having a radius of 100 miles from San Antonio. One trip was made 

 to the south of this region, and collections were made at Falfurrias 

 and Alice, outside of the territory' described. The accompanying 

 map (fig. 1) shows the territory studied, and all of the points at 

 which collections were made are indicated by name and solid black 

 circle. It will be observed that more attention was paid to the 

 eastern and southeastern portions of the territory than elsewhere. 

 The explanation for this will be evident by reference to the discus- 

 sion of crops, native vegetation, and topography of the region. 



PHYSIOGRAPHY AND SOILS. 



The region studied occupies the coastal plain of Texas in the south 

 and east and extends into the Edwards Plateau and Llano country in 

 the northwest. It is traversed diagonally, beginning in the northern 

 part, by the Colorado, Guadalupe, San Antonio, Medina, Frio, and 

 Nueces Rivers, most of which rise in the edge of the Edwards 

 Plateau and cross the coastal plain to the gulf. A gradual rise 

 characterizes the elevation from the low coastal prairie in the south- 

 east to the rough mountain country of the Edwards Plateau in the 

 northwest. Table I shows the elevations for different stations. 



Table I. — Elevation for prhicipnl .'Stations. 



The region under consideration includes part of the three units of 

 the coastal plain. In the extreme southeastern portion, in Victoria, 

 Goliad, and Bee Counties, may be found the interior border of the 

 coast prairie region, which is flat, low lying, and generally treeless, 

 with the exception of the river valleys. In parts of this area the 



226 



