In this section:
Replant Disorder
Cause
A range of soil pathogens (nematodes, fungi) are often implicated in replant problems. Interactions of these with poor soil structure, drainage or nutrition have also been responsible.
Symptoms
Replant disorder occurs where a tree crop is replanted on land previously planted to that crop or a related one. The severity varies, having no noticeable impact in some situations.
In replant situations, newly planted trees are often slow to establish, tree growth may be uneven and a number of trees may die. Apart from poor growth, trees do not show any other obvious or distinguishing symptoms. Growth may be inhibited for several years, and in some cases the orchard may never reach its expected potential.
Control
Where possible avoid replanting the same tree crop in the same location.
In many cases, soil fumigation has improved growth and establishment of trees in replant situations. Soil fumigation must be carried out by a licensed operator.
Selection of rootstocks can also have a substantial impact on the performance of trees in replant situations.
