26 A PLANT-DISEASE SURVEY IN TEXAS. 



FIG. 



Die-back (Diplodia sycina Mont. var. syconophila Baca). — Trees 

 of the fig (Ficus carica L. var.) on which this disease is present have 

 dead branches sometimes extending well down toward the trunk. 



Underneath the bark, and often breaking through, are densely 

 aggregated, black pycnidia, 350 to 400 /x in diameter, containing oval 

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



Specimens collected : Beeville, 1843, Luling, 2242. 



Leaf -blotch (Cercospora fici Heald and AVolf, 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 below. They vary in size 

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

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

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

 brown, 60 to 180 by 3 to 4.5 /*, 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: Victoria, 2501; Cuero, 2593 (type specimen) ; Flatonia, 

 2711; Hallettsville, 2784. 



Eoot-knot (Heterodera radicicola (Greef) Miil.). — 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; Nursery, 2555. 



Root-rot (Ozonium omnivorum Shear). — This trouble was observed 

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

 serious loss among the cuttings. 



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



E,ust (Physopella fici (Cast.) Arth.). — The circular yellowish- 

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

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

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

 much defoliation. 



Specimens collected: Austin, 458; Falfurrias, 2458. 



Rusty-leaf (Cercospora oolleana (Thm.) Speg.). — Small yellowish- 

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

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

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



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