I pruned my Mesquite tree prior in July 4th

Question

Hi, Having to go back North for 8 weeks I pruned my Chilean Mesquite preparing for the Arizona Monsoon season. tree planted 3 yrs ago Trunk now about 5″ diam. hight 15 feet x 15′ wide
Upon my return the tree is 95 % brown ? other 3 trees are fine pruned the same time.
Perhaps The heat 110 degrees was to harsh for the late pruning
I have a drip ( 3 ) emitters 1 gal hr. every day 15 Min about 1 1/2 quarts a day. all trees the same.
When I trimmed I took off branches growing down, and crooked out or rubbing another
trying to keep all branches growing up and/or out I did no canopy trimming.
I did cut limbs close to the main branches. ” Perhaps this was the error”

Answer 1

Without seeing the damage, it will be hard to know for certain. It will be most likely that a couple of the trees could have contracted a fungal infection. This is, absolutely, due to timing of pruning.

These trees should really only be pruned during dormancy, but they can take a very, very light pruning in spring.

I would apply a fungicide to the parts of the tree above ground. This article will help: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

You can also treat the ground around the tree with DOLOMITIC LIME and WETTABLE SULFUR according to all packaging instructions.

This article will help you to prune these trees: https://www.gardeningknowhow.com/ornamental/trees/mesquite/mesquite-tree-pruning.htm

This one will help you with general care: https://www.gardeningknowhow.com/ornamental/trees/mesquite/growing-mesquite-trees.htm