Answer: Much depends on the fungi that causes the rot, and there are quite a few. Usually, by the time root rot is detected, the tree is way past any chance of recovery. Some root rot fungi only attack damaged or weak trees, and others attack healthy trees. If your tree is attacked by the latter, to not replant other succeptible species in that area. Your agricultural extension service (ph# 916/224-4900)or forest service should have a plant pathology lab that can identify the fungi for you, and tell you how to procede. A certified arborist may also be of help. It's possible that an antibiotic injections can keep the disease in check, but these are usually quite expensive.
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