Infected trees often show a lack of vigor and may show wilt symptoms during dry periods. Nursery stock showing any sign of root-knot nematode should not be planted. Lovell root stock, the recommended peach root stock for most of Georgia, has no resistance to root-knot nematode. Nemagard root stock, which is generally not recommended for Georgia, shows resistance to M. incognita and M. javanica but has no resistance to M. hapla or M. arenaria . All efforts to control root-knot nematode should be made prior to planting an orchard.
Crown gall occurs as tumorous rough surface growths on roots and crowns of trees.
Galls can be verb smallto more than a foot in diameter. The bacteria enter the tree through fresh wounds. Crown gall can be a veryserious problem for nurserymen. Trees infected when very young may soon die. Older trees may become weaker, but generally do not die from crown gall.