I live in Texas and have just had the same problem. I have about 20 that have had for 20 years and are dwarf and in shape of Horse Shoe. My other ones up at the house are fine. The new growth was about 2 1/2 inches and the leaves have wilted and falling off and getting bad. I did preventative pest spray last week but still dying. No one down here can figure it out Lowes, Home Depot or Covingtons!!!!