If one keeps doing multiple things to the Plant, one is unlikely to be able to discover WHICH is working or not. I can't see in your pix what the problem is, but you mentioned it had been cold & you'd been watering too much. The combination of cold & wet can be deadly to many succulents. If it's cold then don't water. Here's where the succulent motto comes in: As to watering, when in doubt, don't No one has addressed what your mix is, perhaps it's not fast draining enough. Lastly, does the pot have a drainage hole? I'd check the drainage & then I'd leave the plant alone to recover for a while.

Thanks for the replies. Dan ... the dirt was indeed placed directly on the native soil, although calling it "native" might be misleading because it was backfilled against the front porch when the house was built 3.5 yrs ago. The width of the bed is about 6-7', and the distance from the bed surface to the previous surface is probably a couple of feet under the tree. The bed is held in place by a retaining wall about 3' high on one side and the front porch on the other side. I'll try to snap a photo and post it. Ken ... you may be right about the sprinkler, but I didn't want to trust my diligence in watering it so I had dedicated heads put on all of the plantings in the primary landscaping beds ... the head seems to soak the area pretty well, but my wife and I were planning to investigate as you suggested to see if we needed to do something different ... The heads are small adjustable units that spray a continuous wedge-shaped curtain of water ... we have this head placed about 18" from the trunk so that it covers a fairly wide swath around the base of the tree. In the hot season, I run it twice (with a break to allow the water to soak in) every other day ... other times I back it off to every third or every fourth day. The tree is about 30" tall, with a canopy about twice that in one direction and about 3' in the other (it's growing mostly in one direction, which is why we selected it for this area). The trunk is perhaps 2-3" dia, so it's a fairly solid little guy. Thanks again for the feedback ... I still have so much to learn!

Wolfridgeil - I too thought it odd that the damage started primarily at the leaf tip. My suspicions right now are either the Spotted Tentiform Leafminer or the Apple Leafminer, but I'm still not sure I have a positive ID. The damaged leaves visible in the second link you provided look very similar to the leaves on my trees, although the larvae were much, much smaller than the caterpillar pictured. In an effort to rid the trees of the problem, I took the time to pinch each "tent" that had formed, with the intent of killing whatever larvae resided within. Barring a second generation of the pest, this should rid my trees of the problem for this year. Interestingly, it primarily affected only two of the six apples trees. Bradybb - If you have fruit trees that are displaying similar symptoms, be sure that small "tents" aren't forming on the leaves. If they are, I encourage you to open one up to see what you find.

Aside from the brown areas on the leaves, this is a very healthy looking Australian Brush Cherry tree. The bottom of the leaves show no discoloration. Does anyone know what this is? Thanks, Rob