orchid trees in s.w. louisiana trouble

[vbflmt]

i am losing an orchid tree. the only thing done differently was last week i sprayed fungicide soap in my landscape do not remember if the tree was sprayed or not. there was a set of gardinia shrubs next to the tree that was sprayed but the trees very large overhanging branches could have gotten some overspray. also, one of the bigger branches of the tree had broken due to weather. i cut that branch just a little under the dead part making sure of a clean cut. any ideas? this week 1/4 of tree dead.