wilt appears as yellowing on the leaf margins and between veins of magnolia
leaves. The infected leaves wilt, die and prematurely fall from the magnolia.
This fungal disease begins at the tops of leaves and works its way back toward
the tree branches. Verticillium wilt is not present in cool temperatures; the
first signs of the fungal disease won`t be visible until
the weather warms. There is no acceptable fungicide control to treat
verticillium wilt. However, cultural control will help prevent this damaging
fungal disease from attacking the magnolia. Planting magnolia trees in
disease-free soil greatly reduces the chance of verticillium wilt. You can
sterilize the soil before planting with solarization to kill pathogens living
in the top several inches of the soil.
Avoid stressful conditions for the plants, including
overwatering, drought and root-wounding that will facilitate Verticilliumspp.
infection. Avoid planting in areas with previous outbreaks of Verticilliumwilt.
Fungicides are not effective in management of Verticilliumwilt.
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