IQ 
Bui. 1474, U. S. Department of Agriculture 
Plate 7 
f : 
4f 
Markings Found on Grapefruit Leaves 
A and B, Typical Bordeaux-oil spray burn on grapefruit leaves. This injury occurs rarely, 
and hence is of minor importance 
C, So-called "black melanose," a leaf injury of uncertain causation which must not be con- 
fused with true melanose 
D, "Star melanose" in enlarged view (X 3). This is probably a form of Bordeaux-spray 
injury 
