Try a foliar application of Miracle-Gro or it's equivalent. Go for the relatively high nitrogen content (first number), but not so high as to enter the lawn fertilizer realm(something 20 or less). Mix it into a watering can 1/2 strength and water liberally over the foliage and then give just a bit to the soil. Finer mist the better, peach tree leaves shed water very well. Do this in early morning before the sun gets hot. If you see no improvement in a few days check back. Make sure it has plenty of water after that...but don't make the soil wet...just moist. To be honest...you're tree doesn't look too bad at all. The quality of the tree from what I can see above ground looks very good. Did it look better when you planted it and if so, how long ago was that? Was it balled and burlapped...has it been brutally hot there? Fruitnut grows awesomely beautiful trees. If he don't see a problem then neither do I. You CERTAINLY have no insect problem there. Looks like a deficiency...most likely N, far less likely Iron...and even less likely magnesium. That doesn't necessarily mean it's not in the soil...just means the plant isn't getting it. Peaches are delicious and they are also a pain in the ass.

I'd say just transplant shock, DrBasil. Just keep watering and fertilizing. You should see new flush appearing, shortly. Patty S.

Definitely not a tree I'd be trying to grow in a pot. They just want to grow too big, too fast. They need very good drainage, and withstand droughts well, so yes, I'd be cautious about over-watering it. And like most Oz natives, very susceptible to death by phosphorous if you're fertilising it. I've never met an Acacia that liked being fertilised at all, and I've grown dozens of different species over decades. Yours appears to be dying/dead. A. baileyana (Cootamundra Wattle) is also a known environmental thug of native bushland, so if you must grow a wattle in a pot, why not choose a smaller species? I'd highly recommend A. cognata in your situation, but as there are more than 1000 species, a trip to a nursery with a good selection might be a good idea... Acacia cognata in pot

TOO MUCH WATER This is almost alway a problem for us northerners because our trees must be able to take a few days with out watering on our hottest days. Here is what I do that works wonders and makes it possible to leave my tree alone for 4 days in upper 90F weather in the summer.Both tangerine trees are 49 weeks old from seed sprout. I use a shop vac plug into GFI now to protect from water that might drip from pot. My trees are also now permanently place on the vacuum chamber bucket for the cold season 'no setting up necessary". 10 seconds morning 10 seconds evening brings me close to my tree 2 times daily to catch problem while they are small. \vacuum chamber hold pot off cold floor. I mulch the surface to hold down evaporative cooling. A fan will do a fantastic amount to draw moisture from the leaves. This will draw much more on the water in the soil. Works best with leaves on the tree before they drop. Don't change your soil now but wait till spring and use what I am using to get you through the winter.