Health of my sick holly bush
My holly bush has a new large of dead branches on one side however the leaves on the balance of the bush are healthy looking and the plant is sprouting new fall growth at the top of this 6 ft. bush? What is causing this problem what can I do to treat the problem?
Scale insect attack is one possibility. This is an insect that can cause the leaves on one part of a holly (or several other shrubs) to turn brown and fall off:
Environmental damage such as scorch can also damage one side of a shrub. In this case pruning off the dead branches will fix the problem.
Also check this article for diseases affecting holly: