Bulletin 229, Diseases of Citrus in Florida


organism. In such a disease as withertip it is not safe to con-
clude from the mere presence of the organism that it has been
responsible for a given injury.
 In the case of limes, on the other hand, the withertip fungus
attacks young shoots, leaves, and fruits while they are still
tender. The infected twigs wither and shrivel at the tips for
a distance of from one to several inches. In some cases they may


 Fig. 39.-Anthracnose on grapefruit.
be girdled by an attack farther back, in which case they fall
over and hang lifeless as if attacked by some insect. Young
leaves which are sometimes infected but not entirely killed may
have dead areas on the margins or tips with distortion of the
remaining portions as further growth takes place. The flower
buds, when attacked, turn brown and fall without opening. If
severe infection occurs later as the buds open, the flowers may
drop before the fruit sets.