Florida Agricultural Experiment Station


is most abundant and causes the greatest injury. For this
reason, there has been considerable difference of opinion among
investigators and growers as to the part played by the fungus in
any given outbreak of withertip.
































Fig. 43.-Grapefruit leaves attacked by the withertip fungus. These leaves
 were turning yellow and falling from the tree. Note the character-
 istic fruiting bodies of the fungus, consisting of concentric zones of
 minute black pustules formed on the dead areas of the leaves.

 In regard to the withertip and anthracnose previously de-
 scribed on the lime, which is caused by Gloeosporium limettico-
 lum Clausen, there never has been any doubt as to the parasitic
 nature of the organism involved, since it attacks young growing
 tissue and not the mature tissue.