Bulletin 229, Diseases of Citrus in Florida


rounding healthy bark. The surfaces remain smooth for a time
and are covered by a thin, glazed membrane, which becomes more
or less bleached with age and dotted with the pustules of the
withertip fungus (Fig. 92).
 A tree that has been killed or severely injured by lightning
should be replaced. Trees less severely injured may be saved by
careful treatment.
If the bark has not
been killed over
more than two-
thirds of the cir-
cumference, the tree
can often be saved
by cutting out all
the injured bark
and painting the
wound with a good
waterproof wound
dressing. Repair of
extensive bark in-
juries can be has-
tened greatly by
bridge grafting or
inarching. In case
one or more sprouts
do not develop from
the root crown so
that they can be in-
arched above the in-
jury, a small tree
can be planted close
to the trunk on the
injured side and in-
arched at the first
favorable time. All
badly injured twigs Fig. 92.-Lightning injury on citrus twigs. En-
and b r a n c h e s large view of spots, showing the green buds,
should be pruned thorns and leaf-stalks in the dead areas of bark.
out.
 HAIL INJURY

 Citrus trees and the fruit crop are sometimes more or less
 severely injured by hail, the extent of the damage depending