Answer: It's difficult to say whether the plant was that way when you purchased it (due to overfertilization or too much/too little light on that one side), or if it is responding to a change in evironment or to being transplanted. Areca Palm, Chrysalidocarpus lutescens, is fussier about overwatering and more prone to root rot than other palms; their medium green foliage has a tendency to yellow when heavily fertilized. Areca palm does best when growing conditions are relatively warm. Since it's late in the growing season, I'd avoid fertilizing to make it green up. In the spring when growth resumes, you can feed it with a diluted solution of liquid fertilizer such as Miracle Gro, Peter's or Shultz's. By the way, don't be fooled by sooty-looking flecks on sheaths that form the stems of Areca palms; they occur naturally and do not signify insect or disease problems.
Best wishes with your new plant!
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