26 A PLANT-DISEASE SUKVEY IN TEXAS. 



FIG. 



Die-back {Diplodia sycina ]\Iont. var. syconophila Sacc). — Trees 

 of the fig {Ficus carica L. var.) on which this disease is present liave 

 dead branches sometimes extending well down toward the tiimk. 



Underneath the bark, and often breaking through, are densely- 

 aggregated, black pycnidia, 350 to 400 fi in diameter, containing oval 

 to elliptical, brown, two-celled spores, 18 to 35 by 9 to 14 fi. 



Specimens collected : Beeville, 1843, Luling, 2242. 



Leaf-blotch {Cercospora fici Heald and Wolf, 32).— This trouble 

 appears late in the summer, forming large angular or irregular 

 spots on the leaves. The spots are dirty brown above with a darker 

 border and uniformly yellowish brown beloAv. They vary in size 

 from 1.5 to 10 mm., and when confluent may exceed this measurement. 

 The conidiophores are borne in dense fascicles on the upper sur- 

 face, 24 by 4 [JL, and are dilute brown. The conidia are clavate, 

 brown, 60 to 180 by 3 to 4.5 fi, and many septate. (PI. II, fig. 8.) 



The disease was very abundant in several localities, involving half 

 the leaf surface and causing the leaves to fall. 



Specimens collected: Alctoria, 2501; Cuero, 2593 (type specimen) ; Flatonia, 

 2711 ; Hallettsville, 2784. 



Root-knot {Heterodera radieicola (Greef) Mill.).— Both mature 

 trees in the orchard and cuttings in the nursery are affected. Some- 

 times the roots near the surface of the ground are abundantly cov- 

 ered with the galls. On the older trees it is productive of no ap- 

 parent injury. 



Specimens collected : Beeville, 1848 ; Nnrsery, 2555. 



Root-rot {Ozonhmi o?nnivorvm Shear).— This trouble was observed 

 in two nurserias in which it was very common and productive of 

 serious loss among the cuttings. 



Specimens collected: New Braunfels, 1678; Beeville, 1851. 



Rust {Physopella fci (Cast.) Arth.).— The circular yellowish- 

 brown sori about 1 nun. in diameter are produced in great numbers 

 on the lower surface of the leaves. This disease appears in such 

 abundance in kite summer as to cause the yellowing of the leaves and 

 much defoliation. 



Specimens collected: Austin, 458; Falfurrias, 2458. 



Rusty-leaf {Cercospora holle ana (Thm.) Speg.).— Small j^ellowish- 

 brown spots 1 nun. or less in diameter appear on the foliage. The 

 spots are more prominent and more yellow on the under surface than 

 on the upper. AVhen the spots are abundant a considerable amount 



226 



