This Navajo globe willow is dying why

Question

See picture dying from top doen

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Answer 1

These plants are vulnerable to many different types of diseases and pests. Here's an article from Arizona State University that may be helpful: http://www.public.asu.edu/~camartin/plants/Plant%20html%20files/salixmatsudana.html
I'm also going to recommend that you contact your local university extension agent to learn more about growing this plant in your area. Here's a link for them: https://www.gardeningknowhow.com/extension-search?zip=81007&radius=50&services_search_action=search&submit=Search