Florida Agricultural Experiment Station


sue, and thus furnishes abundant facilities for the entry of the
more rapidly growing Alternaria. The spots caused by Cercospora
are usually small, rarely as large as a quarter of an inch in diam-
eter, and are rather characteristic in appearance, due to their pur-
ple border and the bleached, whitish appearance of their centers
which often fall out, giving the leaf a ragged appearance. The


 Fig. 14. Cercospora
leaf spot. Note the whit-
ish centers of the spots.


spores are borne on clumps of dark-colored conidiophores that may
sometimes be seen with naked eye in the center of the spots, and
later in the season the perithecia of the perfect stage may appear.
In Fig. 14 are shown Cercospora spots on a cotton leaf.