Stunted and dying burning bush

Asked September 13, 2017, 5:26 PM EDT

I planted multiple Burning bush plants about 5 years ago. They are so stunted and sad looking compared to what I'm sure they should look like. Over the past 18 months 2 have just dried up and died after putting on Spring foliage. Where do I start to identify whats eating them? I'm stumped. The white is diatomaceous earth. I have seen what looks like spider webs on them. I would prefer to use something nature if possible as I feed birds and don't want to use anything that would cause them harm,

La Plata County Colorado trees and shrubs

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