12 
BULLETIN 1474, IT. S. DEPARTMENT OF AGRICULTURE 
type of stem-end rot, either actually renders unfit for human con- 
sumption or impairs the market value of more citrus fruit than all 
other active parasitic diseases combined. The damage* resulting from 
Phomopsis infection may be divided into three general classes: 
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Fig. 1. — Map of Florida, showing by shading the round-orange and grapefruit belt 
and the principal regions of melanose infection. Citrus plantings are found at 
many scattered points outside the shaded areas 
(1) Injury to the tree in the form of leaf and twig blemishes which in severe 
cases result in twig defoliation and death of tender twig growth. 
(2) Melanose scars on fruit that reduce or may even destroy the sale value 
of a large part of the crop. 
(3) Stem-end decay of fruit, that may develop in the grove, in transit, on the 
market, or after the fruit reaches the consumer. 
