Abstract
INVESTIGATIONS at this Station have disclosed that molybdenum deficiency is found in citrus trees throughout the citrus-growing area of Florida. The symptom of this deficiency has been called yellow spot since it was first described by Floyd1 in 1908. Yellow spot has also been reported in citrus on the Isle of Pines2. Repeated studies3 failed to demonstrate that it was due to an infectious fungus, bacterium or virus. It is known to occur on practically all kinds of citrus ; but the rootstock greatly affects the extent to which the tree is injured. Trees on grapefruit rootstock are much more seriously affected than are trees on other rootstocks. This is one of the reasons why grapefruit has not been widely used as a root-stock in Florida.
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References
Floyd, B. F., Fla. Agric. Exp. Sta. Ann. Rept., 1908.
Rhoads, A. S., and DeBusk, E. F., Fla. Agr. Exp. Sta. Bull., 229, 174 (1931).
Knorr, L. C., and Wander, I. W., Citrus Mag., 13, 24 (1950).
Southwick, Roy. W., Proc. Amer. Soc. Hort. Sci., 46, 27 (1945).
Vanselow, Albert P., and Datta, Narayan P., Soil. Sci., 67, 363 (1949).
Evans, H. J., Purvis, E. R., and Bear, F. E., Soil Sci., 71, 117 (1951). Robinson, W. O., Edgington, Glen, Armiger, W. H., and Breen, A. V., Soil Sci., 72, 267 (1951).
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STEWART, I., LEONARD, C. Molybdenum Deficiency in Florida Citrus. Nature 170, 714–715 (1952). https://doi.org/10.1038/170714b0
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DOI: https://doi.org/10.1038/170714b0
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