We have 5 yews in our front flower beds. The two that are in the same bed are fine. There are 3 in another bed together and 2 of them are mostly brown with a little yellow mixed in. I'm not really up on my shrubs, so I thought some of you shrub guys could help me out. What do you think the problem is? Are they to far gone to save? We had a new roof put on this winter, and the roofers covered them with tarps. It appears thet some of the top branches were broken off in the process. Could this be the cause???