Florida Agricultural Experiment Station


the abnormal, hard brownish tissue in the rind will be found to
be co-extensive (Fig. 74). This abnormal tissue usually occupies
a median position in the rind but may attain such an extensive
development as to involve practically all of the white portion of
the rind. Gum pockets occasionally occur at the centers of the
hard, brownish rind inclusions. Although the pulp of the fruits
exhibiting the lumpy rind condition is not affected, the hard,
and often lumpy, condition of the rind impairs the market value
of such fruits.
 The lumpy rind condition in question is distinct from that due
to injury of the fruit by mealy bugs or aphids and may occur on
fruits which also exhibit these insect injuries. This rind ab-
normality appears to be the result of an abnormal growth con-
dition rather than of any injury. The trouble has been known
to occur in the state for several years but appeared to be of ex-
ceptionally widespread occurrence during the season of 1929-30,
occurring abundantly even on apparently healthy trees in well
cared for groves.
 Nothing is known concerning the cause of lumpy rind. The
occurrence of this trouble is frequently associated with declin-
ing trees exhibiting a chronic mottle-leaf or frenched condition
which, in some instances, has developed following liming. In
this case it develops most abundantly on the abnormally small
fruits commonly produced on such trees. It has also been ob-
served on trees that had developed the chronic wilt and decline
known as "blight". The trouble appears to develop much more
readily in the case of trees on rough lemon stock than in those
on sour orange stock.
 GREEN SPOT
 Green spot is a trouble peculiar to citrus fruit that is picked
early in the fall, while still green, and colored artificially. This
trouble is of more or less frequent occurrence in packinghouses
throughout the state where fruit is pre-colored. In California,
the same trouble occurs on oranges and also on lemons that have
been picked green and held for curing.
 SYMPTOMS OF GREEN SPOT
 After the removal of the fruit from the coloring room, certain
fruits are found to have developed irregular, green or brownish-
green spots ranging from small areas to those involving a large
part of the fruit. Although usually green at first, these spots