My variegated Holly is losing leaves rapidly in one section. The disease appears to be contagious. It involves the blackening of the tip of the leaves, followed by it dropping off. I have included a picture of the affected area. We are after the wettest December on record. This seems to have prompted it. Please help me save this tree. I 100% don't want to lose it.
Variegated Holly Leaf Drop
Certified GKH Gardening Expert
The excess water and lack of air circulation are likely the issues that have left your Holly with a fungus disease.
Clean up and destroy all dead material lying on the ground around the plant to help prevent further issues.
Spray the plant with a fungicide, follow application directions on the packaging.
You will likely need to reapply until the plant has made a recovery.
Here are some links to help you.