FT wants full sun, and barring that, wants strong grow lights. Likes air circulation- wind or fan. Likes to have the soil dry out some between waterings- if using potting soil, cut it with 50% perlite or research gritty soil mixes.

So...if it is growing in low light, poor circulation, or the soil is too wet much of the time, the conditions are ripe to weaken the plant and open the door for infestation and/or disease. Tell us about this tree's growing conditions, and post pictures if you can, and show close ups of the leaves and where the bark is breaking.

ez

breathnez is dead on. We need to know details such as if the tree is getting adequate light, proper drainage, and if the tree is on a regular watering schedule. I always tell people avoid all pesticides etc. When the tree is in a weakened state. First get the plant back in a healthy rhythm as far as water and light because pesticides will weaken the tree even more. I hate to see people get excited about bonsai then buy one of these Home Depot or Walmart "Malsai" with no drainage holes and moss glued to the top. It says indoor bonsai on the tag and people don't get any instructions on how to care for bonsai. Then they think it's their fault and get discouraged from the art all together. Can you post pictures, friend?

Fukien Tea Tree Bonsai Care Guide