My arborvitae have brown/beige patches. I didn't notice this 3 weeks ago when I added 3" of compost around them and wondering if adding compost has something to do with it? I did put compost right up to the stem because last winter some of them got uprooted and knocked over during an ice storm, so I wanted to make them more stable. I understand it could be storm damage, but even the arborvitaes that didn't get knocked over have these brown patches. Could it be a fungal disease?