46 BULLETIN 1380, U. S. DEPARTMENT OF AGRICULTURE 
line, usually obtuse at the ends, and 1 septate. In a swollen condi- 
tion they may be constricted at the septa. 
The disease appears to be new, but was not common and is prob- 
ably of little consequence at present. Young trees in dense shade 
were defoliated and twigs were attacked. The fungus is also found 
on old leaves. 
PHYTOPHTHORA LEAF-BLIGHT 
In a small plantation near Para where the trees were associated 
with secondary jungle growth a gray leaf-spot {Phytophthora faheri 
Maubl.) was found both on recently fallen leaves and on leaves still 
attached to the tree. After several heavy rains the leaves fell in 
greater numbers and the green pods began to show infection. On this 
estate and in the jungle near the waterworks at Utinga similarly in- 
fected leaves were found. These leaves were variously mottled 
with yellow and purple, particularly along the midrib, where 
the grayish spots were most in evidence. The leafstalks showed 
shrunken discolored spots and fell with the leaves. An examination 
of the gray splotched areas showed the characteristic fructification of 
a Phytophthora. The fungus in all essentials is apparently the same 
as that attacking the pods and will be discussed under that head 
(p. 51). 
PARODIELLA MELIOLOIDES 
A fungous disease was reported in 1904 by Hennings on living 
leaves of Hevea from material collected by Ule at Jurua Miry in 
August, 1901. The causal species (Parodiella melioloides (B. and 
C.) Wint.) was reported to be especially associated with Euphor- 
biaceie in Brazil and was also found on the leaves of Manihot utilis- 
sima and M. gla&iovii. 
The mycelium forms brownish patches over the surface of the 
leaf. The small spherical reddish brown fructifications appear on 
these patches and mostly on the under side of the leaf. 
• 
OPHIOBOLUS HEVEAE 
A disease caused by the fungus Ophiobolus heveae P. Henn. was 
reported by Hennings on Hevea from a collection made by Ule at 
Sao Joaquim on the Rio Negro in February, 1902. Gray patches ap- 
pear on the surface at the margins of the leaves and finally fuse, cov- 
ering the entire leaf. On the under side of the leaf the mycelium be- 
comes brownish and the leaf soon dies. The small black fructifica- 
tions appear on the gray patches on the upper side of the leaf. 
RIM-BLIGHT 
The term " rim-blight " has been employed in the East to describe 
a form of leaf -blight which extends partly or all around the margin 
of the leaf. This form of leaf injury was found at several localities 
in the Amazon Valley but appeared to be of little or no consequence. 
Since the margins are the only part of the leaves affected the disease 
is very conspicuous (PI. XVIII, A). This blight makes its appear- 
ance as small irregular brownish spots at the edge of mature leaves. 
The edges later turn a lighter brown than the spots and curl to the 
