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Arborvitae has developed brown what?

2 months ago

My 6 year old Arborvitae developed brown spots over the last 3-4 weeks. I live in eastern Mass and it has been a very dry spring and summer. Over the last 3-4 weeks, we have gotten above average rain. None of my 6 other Arborvitaes are seeing this behavior. During the drought, I didn't provide much water to the trees. I imagine this is some form of drought stress manifesting. I need some advice on what to do before it gets worse. Do I cut out these dry branches? Do I start watering several times per week? Do I do nothing and it will work itself out?

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