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Brown green arborvitae

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From: Shannon Fetzer City: Niles , MI
Our trees are on the side of our home. They are 10' tall. The side next to the house is turning brown on many of the trees. We have a sprinkler system so they get watered. The othe side of each tree is beautiful green. The brown side doesn't touch the house but is about 6" from it. Are there known insects that can cause this? Could lack of sunlight affect them? It hasn'thappened in previous years. They are facing west. I trim them in the fall a little. Could that have harmed them?
	Extension Message From: Richard Hentschel Extension Educator, Horticulture DuPage/Kane/Kendall Unit hentsche@illinois.edu
It would not be uncommon for the needles to eventually be lost on the house side. After a period of time or years in place the needles are not able help support the tree and are naturally lost. Not likely an insect problem nor a pruning problem. some interior needle loss is also normal, even on the "green side"
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