Bulletin 229, Diseases of Citrus in Florida


Outside of Florida, this trouble appears to have been reported
only from Porto Rico. This abnormal fruit condition is charac-
terized by the occurrence of from one to several more or less
prominent, hard lumpy places in the rind, usually on the side
of the fruit. In severely affected fruit a large area of the rind
on one side may be characterized by a very hard, thickened, and


 Fig. 74.-Lumpy rind of grapefruit.

more or less lumpy condition. In such cases, the normal growth
of the fruit is retarded on the affected side and the oil cells of
the rind are abnormally small and closely crowded.
 Upon cutting fruits affected by lumpy rind, there is found in
the center of the thickened rind at each hard, lumpy place a
center of hard, brownish, abnormal tissue surrounded by a
watery zone of tissue which, in turn, may be surrounded by
normal rind. Where considerable areas of the rind are affected,