Bulletin 140, Dieback of Citrus Trees


dieback. The disease is also of frequent occurrence in trees
planted in what are known as sand-soaked" spots, sometimes
found in high pineland groves. The spots are small areas of
pure white sand that are somewhat similar to the dune soils.


 FIG. 8.-Dieback marked, or ammoniated fruit. Note coarseness
 of rind

 Trees located on slopes are often subject to dieback. This
may be due to seepage areas bringing about a lack of drainage,
especially during certain seasons of the year; or it may be due
to the leaching and washing of soluble food materials from the
higher grounds so that the trees are overfed. Not all of the
trees on the slope are likely to be affected. They are more often
confined to particular parts of the slope. In some cases, they