Bulletin 229, Diseases of Citrus in Florida


served, from 50 to 75 percent of the fruit exhibited more or less
of the blotchy appearance, much of it being so badly blotched as
to result in its culling in the packinghouse. The development of
this fruit blotch appears to start about midwinter and progresses
rapidly with the advent of warm weather. This trouble has oc-
casioned more or less fruit loss and reduction of grade during


 Fig. 76.-Grapefruit blotch.
the past three years. The blotches do not seem to be sunken to
any extent nor does the trouble seem to result in any breakdown
or decay of the affected fruits.
 The trouble does not appear to be caused by any organism,
as attempts to isolate a causal organism from blotchy fruits
were unsuccessful. However, despite careful field investiga-
tion, nothing in the way of tree condition, cultural practices,
fertilization, or spraying could be correlated consistently with