Palm Problems: chlorosis (shades of yellow) - Symptoms most severe on oldest (lowest) leaves

Chlorosis (shades of yellow)
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a. One or more older leaves uniformly yellow to yellow-orange in color (yellowed leaves may originate mid-canopy in some cases)

lethal yellowing (Fig. 23)
FACTSHEET:

http://edis.ifas.ufl.edu/PP146

b. Chlorosis confined to margins of leaves or leaflets; central portion of leaves or leaflets distinctly green
magnesium deficiency (Fig. 24)
FACTSHEET: http://edis.ifas.ufl.edu/EP266

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