oak wilt at wildwood preserve metropark
TRANSCRIPT
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Oak Wilt at Wildwood Preserve Metropark
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Oak wilt is an aggressive disease caused by an invasive fungus that infects an oak tree’s vascular tissue (xylem), which prevents water from reaching the tree’s leaves.
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This is an example of a leaf from a red oakthat has been stricken by oak wilt. This water-starved leaf condition is also called trifoliation.
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This is an example of a leaf from a red oakthat has been stricken by oak wilt. This water-starved leaf condition is also called trifoliation.
Red oakred oak tree
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White oaks are moderately resistant to the disease and may live several years after being infected.
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red oak leaves (pointy tips)
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red oak leaves (pointy tips)*
*In northwest Ohio red, black, scarlet and pin oaks are well-known forhybridizing and will here be collectively referred to as red oaks.
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red oak leaves (pointy tips)
White oak leaves (rounded tips)
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The primary way oak wilt is spread is from root grafts thatform underground between two trees, allowing fungus to spread from an infected tree to a healthy tree.
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The second way oak wilt is spread is when fungal spore mats form under the bark of an infected tree. If that tree’s bark bursts a sap-feedingbeetle may be attracted to the fungus, feed on the spore mat, then flyto a healthy tree and infect it by entering through a wound in that tree.
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The western part of Wildwood Preserve (about 200 acres) is dominated by a continuous canopy of about 30,000 red oaks trees.
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During the spring of 2014 this area was monitored by Metroparks’ natural resource professionals.
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After more trees were found dead and dying, samples were collected by the OSU Extension which confirmed that sporesof oak wilt were present.
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Our MethodsAn aerial survey confirmedthe ground survey results andlooked for other oak wilt“hot spots.”
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Management methods:
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Sanitation:Removal of potential spore-producing trees and…
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…contain the spores within those trees.
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Root graft disruption
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By using a tractor-mounted trenching tool called a vibratory plow to break root grafts between an infected tree and other nearby oak trees.
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To separate infected roots from healthy roots.
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A rather clean look after treatment that will be imperceptible in a couple of years.
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The oak wilt outbreak needsto be contained now…
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…to ensure the health of Wildwood Preserve’s beautiful oak forest, forever.
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