Hi Dede, I faced a similar problem with one of my Den (Alba). However, it is a new shoot which became yellow when it was about 6 inches long. It just became yellow and died back. At that time, the plant was spiking too from another mature cane, and sadly, 2 of the spikes also died back. In my case, I believe is too much water during the growth period. Well, now, there are new shoots appearing again. Hopefully they will mature! Happy growing!