62 A PLANT-DISEASE SURVEY IN TEXAS. 



guttulate, 45 to 105 by 3 to 4 /*, and obscurely septate. (PL III, 

 fig. 3.) 



Where the disease has been observed the trees were almost entirely 

 deprived of their leaves. 



Specimens collected: Victoria, 2539 (type specimens) ; Austin, 2869. 



CAPE JASMINE. 



Sooty mold (Fumago vagans (?) P.). — The upper surface of the 

 leaves of the Cape jasmine {Gardenia jasminoides Ellis) is entirely 

 covered by a black, filmy crust. Plant lice were also present. 



Specimen collected : Austin, 216. 



CATALPA. 



Leaf -blight. — Nursery trees and older trees of catalpa (Catalpa sp.) 

 are frequently sufferers from a severe leaf -blight in which a species 

 of Cercospora probably plays a secondary part. In some cases irreg- 

 ular, dead, brown areas occur along the margin and extend downward 

 between the prominent radiating veins; or isolated brown spots, 

 small or of considerable size, may occupy a similar position. In some 

 spots the Cercospora may be mingled with an Alternaria, or Cer- 

 cospora may be the only fungus present, and in one case Alternaria 

 with little or no Cercospora was observed. In the specimens which 

 showed the most severe development of the disease, with large dead 

 areas involving in some cases nearly half of a leaf, much concentric 

 zonation was characteristic; scattered over the brown, dead areas 

 were numerous subcircular gray or white spots, 1 to 2 mm. in diam- 

 eter, which produced central conidiophore tufts on both surfaces. 



Conidiophores densely clustered, brown, becoming lighter toward 

 the apex, few septate, irregular nodose tips, 60 to 75 by 3 to 4 n, with 

 occasional individuals of double the average length. Spores slender 

 clavate, straight or only slightly curved, hyaline, few to many septate, 

 and 42 to 130 by 3 to 4.5 /x. 



The Cercospora on our specimens differs from Cercospora catalpae 

 Wint., especially in having much longer and more slender spores, and 

 also by producing amphigenous conidial tufts, but they should prob- 

 ably be referred to this species. 



In the territory covered by this report the species of catalpa make 

 a poor and frequently crippled growth and the foliage shows the 

 effect of excessive transpiration in the early part of the season. The 

 position and characteristics of the dead areas indicate that the trouble 

 is largely physiological and that the fungi present find an easy 

 growth in the dead or languid tissues. 



Specimens collected: New Braunfels, 1674, 1681; Luling, 2239; Falfurrias, 

 2464. 



226 



