Bulletin 140, Dieback of Citrus Trees


practice has been to use from one-fourth to one pound about each
tree, the amount used depending on the size of the tree. Grossen-
bacher made some tests with this chemical (Cure for Dieback of


 FIG. 14.-Orange tree affected with dieback. Note frenching of
 the foliage in the lower half of the tree

Citrus Trees, Florida Grower, Jan. 29, 1916) about several
affected grapefruit trees from four to six years old and
found that better results were obtained when it was used in
quantity. He found the bluestone to be most effective as a
preventive when a total of not less than four pounds per tree