Nematode-Related Replant Problems
Replanted fruit trees frequently have problems with reestablishment. The cause of these replant problems has been extremely difficult to pinpoint because of the abundance of microorganisms that have been isolated from replant sites. The available evidence indicates that replant disease results from an interaction between nematodes and various microflora. The nematode most frequently associated with this problem is the lesion nematode. The lesion nematode is very destructive; it burrows through the root as it feeds, leaving a trail of dead cells that appear as dark lesions. These wounds allow bacteria and fungi to enter the root. In older, well-established trees, a balance exists between new root growth and the activities of nematodes and microorganisms. When old trees are replaced with seedling trees, however, the balance is upset and the young trees cannot compete with the high populations of pathogens present.
You are here.