Dead holly bush: any theories?
Something killed this holly bush very quickly and thoroughly, within just a few weeks. This happened late last winter. It is along the road at the top of our ridge, where we don't see it everyday. We didn't see it dying; it was fine and then within about 3 weeks, we saw it was dead and naked. Neither bush beside it was affected at the time. Months later, the bush on its left began to look sickly with leaves falling off. It is dead too now, although this time it took the better part of a year to die. We saw no sign of pests or disease. It looks more like someone put Roundup on the first bush, although I can't imagine that. Any theories?
I am posting a couple shots of the bushes. One, where you can't se the dead bush, shows how the bushes looked beforehand, and that they are still healthy. The shot of the dead bush shows how it came to look after just a few weeks last year.