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In the nursery, a sterile planting medium should be used. Plant in well-drained fields and rotate contaminated field sites with non-host plants such as grasses or grains. Check roots, crowns, trunks and scaffolds for crown gall.
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Monitor young trees for signs of collapse and older trees for loss of vigour. Inspect nursery trees for signs of galls before planting. There is no tolerance for crown gall infested nursery trees. Symptoms may develop in a few weeks at moderate temperatures or the bacterium may remain latent for 2-5 years before symptoms are produced. These galls may develop on unwounded tissue and the bacteria cannot be found associated with them. In addition to primary galls, secondary galls sometimes develop at some distance from the initial infection. If crown gall occurs in the nursery, symptoms are usually well developed on finished trees at the time of digging. The proliferation of these cells results in gall formation. A portion of the bacteria’s genetic material becomes incorporated into that of the host cells, causing them to proliferate and produce unusual amino acids that serve as a food source for the bacteria.
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Following infection, crown gall bacteria invade the host tissue, multiplying between host cells. They may also enter through wounds made by root feeding insects. Young trees may be killed while older trees suffer reduced growth and vigour.īacteria enter the roots and crown through wounds produced in caring for, and handling the nursery stock. The galls interfere with the normal flow of water and nutrients. Seedlings can be infected during germination if planted into infested soil. Established trees are infected only through wounds, such as those caused by growth cracks, pruning, damage from cultivation equipment or freezing injury.
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The bacterium can survive in the soil for at least 1 year in the absence of host tissue. Bacteria are released into the soil when galls are wet or when older gall tissue disintegrates. The pathogen affects a wide range of broadleaf, woody plants, including stone fruits. Root knot nematode galling on roots - swelling occurs across the entire diameter of the root rather than just on one side
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