Desert Willow branch wilt

I have a Desert Willow that is showing signs of branch wilt. It started with one branch then moved to other branches towards the bottom of the tree. Not all lower branches are effected (there are branches lower than the wilted branches that are doing great).

I shared a photo: Does anyone know if these branches are experiencing disease, and if so, should I use a loper to remove them off asap? How would one proceed to address?

Location: Central Texas
Drainage: The bed is amended 3 feet deep by 5 feet wide
Age: Planted small tree early spring, vigorous growth

I have a companion Desert Willow 10 feet away that is doing great, with no branch wilt.

Great to catch this problem early Charlie! My guess is excessive water but mysteries in the "amended soil" could also be the culprit. The easy solution is to shut down the water. In my experience with desert willows in Albuquerque, too much water can stress, rot, invite disease and kill the tree. Since you have lots of beautiful hardscape around the willow, the plant is probably getting more water from roof and walkway runoff.  The spring-planted tree probably needed extra water to get established in the dry season. Now that the trees have taken off, it is time to cut off the extra water and let this plant survive on its own. Dig gently into the amended soil and make sure the soil is dry for a good 10 inches. Below that, some dampness is fine. Saturation would be a real problem; is the basin draining? Compare the soil moisture level to the healthy willow 10 feet away. When plants look like they're dying, we often try to save them with more water. Resist that approach with the desert willow.