Answer: If not too many fronds are affected, you can trim them off. The plant needs the green parts of the fronds to manufacture food so if the damage is extensive, you might want to leave the fronds alone until new ones are produced. If only a few fronds are affected you can trim them off to make the plant look more attractive. The yellowing and browning are permanent so if you leave the fronds on the plant they will always look damaged. But eventually new fronds will cover over the damage and eventually you can cut them off the plant. Best wishes with your sago!
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