Aucuba black leaves
I've noticed two Aucuba japonica "Crotonifolia' in two separate gardens with completely black leaves that have wilted. This happened before this recent heatwave and one is in partial shade and kept watered so it isn't the heat. The rest of the plant seems fine but some entire branches have blackened and died back. I also noticed a few leaves on an A. japonica 'Dentata' too which I hadn't seen before. Any ideas what is causing it? Many thanks.