Trees, Shrubs and Conifers: Yellowish sickly Nandina, 1 by pennefeather

pennefeather wrote:
This is a picture of one of the previously unaffected nandinas. It too is starting to have yellowing. I am hoping to stop this process before it become like the first one.

Since I have never grown these, I am stumped. I thought it might be a mineral deficiency, but I have tried adding addditional alfalfa tea to increase the nitrogen to no avail. As far as I can tell, there isn't an insect on the bushes. They are small one or two gallon shrubs. Could it be a fungal disease?

Any additional insight would be appreciated.