sago turning yellow
There are several problems that might cause such symptoms. Sago palms are quite susceptible to scale insects. They feed on the fronds and first cause yellowing, but fronds may brown if the infestation is severe. Check the leaves for the presence of the scale insects (look like bumps on the leaves.)
Sagos are also sensitive to micronutrient deficiencies, which could show up as yellowing and browning leaves. If you haven't fertilized with a fertilizer containing micronutrients, this might be the case.
Sagos also are susceptible to leaf spot disease, but that usually would affect older leaves, too.
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