This is the time of year stags shed last year's fronds. Sometimes they yellow a little before dropping; sometimes not. If your new growth looks good, not to worry.

Thanks houstonpat. I'm familiar with the routine shedding of fronds and I'm afraid this isn't it. It's been doing this rather consistantly for some time, even when it was inside the house for the winter, although not to such as great an extent as now. Both stags were brought outside at the same time; late April, if I remember correctly, but certainly when the temps were no lower than 50 at night.

At this rate, it will drop fronds faster than it can produce them. I don't believe the older stag has dropped any within the last month. I'll hang in there and hope that the young one is able to recover.