Trees and Timber 



403 



The causal fungus has been reported in America from 

 Kansas, Missouri, New York, and New Jersey. 



SYCAMORE 



Blight (Gnomonia veneta (S. & S.) Kleb., Gloeosporium) . — 

 First noted in 1848, this anthracnose is very widely dis- 

 tributed on sycamore and oak 

 from New Jersey to California 

 and Mississippi. In extreme 

 cases it may so weaken the trees 

 as to cause their death. The 

 scorched appearance of the 

 leaves and defoliation render 

 the trees unsightly. Just before 

 they become full-grown the 

 leaves give the first indication 

 of the attack. Beginning near 

 the veins or ribs or upon the 

 petiole, the disease causes a 

 stoppage of the water supply 

 to the more distant portions of 

 the leaf, resulting in dead areas. 



Dead twigs should be pruned 

 out, and infected material col- 

 lected and burned. Spraying 

 with Bordeaux mixture may be 

 practiced if the expense is war- 

 ranted. 



WALNUT 



Anthracnose (Gnomonia lepto- 

 styla (Fries) C. & d. Not. Mars- 

 sonina). — Conspicuous brown 



spots, 2^ mm. in diameter, t^ ^.. „r , x x • 



^ ' ,1 , ., ,• , FiG- 214. — Walnut twig 



appear upon the leaflets, which blighted by bacteria. After 



soon yellow and fall. Upon the R. E. Smith. 



