University of California

Nutrition and composition of the Deglet Noor palm in relation to the decline disease


A. R. C. Haas
L. J. Klotz

Authors Affiliations

A. R. C. Haas was Associate Plant Physiologist in the Experiment Station; L. J. Klotz was Associate Plant Pathologist in the Experiment Station.

Publication Information

Hilgardia 5(16):511-530. DOI:10.3733/hilg.v05n16p511. April 1931.

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Abstract does not appear. First page follows.

The Deglet Noor is the most important variety of the date palm grown in the Coachella Valley. This variety, however, is very susceptible to a decline disease to which the small number of individual palms of other varieties which happen to be in the same gardens, thus far appear to be less susceptible. As the malady may rapidly become of considerable economic importance it was thought desirable to record at this time these preliminary observations and data.

Symptoms of the Decline Disease

The symptoms of the decline disease are: a greatly retarded growth of the stem buds, a lack of the normal dark-green color, and a reduction in the quality and quantity of the fruit. Some diseased palms may continue to produce marketable, although inferior fruit, for long periods. Ultimately, the palms fail to produce fruit. The area including the diseased palms enlarges gradually from year to year.

Literature Cited

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Haas A, Klotz L. 1931. Nutrition and composition of the Deglet Noor palm in relation to the decline disease. Hilgardia 5(16):511-530. DOI:10.3733/hilg.v05n16p511
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