Indian Hawthorn Shrubs Dying
I have several Indian Hawthorn shrubs in the beds on the norht side of my house that are about 8 yrs. old, 3 to 5 ft. tall and most look very healthy. Occasionally, one of the shrubs just decides to die, usually in late summer. The leaves turn brown and just shrivel up for no apparent reason. This process usually takes only a few days and dies very wuickly. I don't see any visible problem shuch as mildew, black leaf spots, insects, or anything. Sometimes, just one branch will die and I prune it off. The plant will eventually grow back full, but it takes a year or two. Sometimes, though, the whole shrub will die. Does anyone have any ideas on what could cause this and have a remedy to stop it?