Bulletin 214, Cotton Diseases in Florida


Fig. 6.-Cotton leaves showing two types of rust in-
 jury.


them when in full
vigor, and defol-
iation is often
hastened in this
manner, especial-
ly in wet weather.
The Alternaria
disease mention-
ed in connection
with bacterial
blight is the most
common of the
secondary para-
sites aggravating
rust injury. Two
types of rust in-
jury are shown
in Fig. 6.

 CONTROL
 Fields showing
rust must be built
up if cotton is to
be grown success-
fully. This may
be done by rota-
tions in which or-
ganic matter or
humus is added to
the soil, and by
proper tillage,
drainage of low
areas, and proper
fertilization. Pot-
ash often acts al-
most as a specific
in controlling
rust, but without
proper attention