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PLUMMER  ROAD

Partial closing on Tuesday, July 8th

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Oak wilt in Wisconsin

Oak wilt is widespread in southern Wisconsin but in much of northern Wisconsin it is still a new and uncommon disease.

Distribution of oak wilt in Wisconsin Distribution of oak wilt in Wisconsin (as of November 4, 2013). Note that oak wilt was first confirmed in Rusk County in the summer of 2013.

 

 

Preventing oak wilt

In urban/residential areas

Oak trees are most easily infected by overland spread in the springtime, from bud swelling until two to three weeks past full leaf development. The Wisconsin Department of Natural Resources recommends that you avoid pruning, cutting, or wounding oak April through July (April, May, June, and July) in urban areas. Observations and unpublished research have shown that overland infection can occur after July, yet these mid-summer through early fall infections are not common. To take a very cautious approach, do not prune or otherwise wound oaks from April to October.

In some years, spring comes much earlier. If daytime temperatures begin to reach the 50-degree mark, stop pruning oak at that time, even if it is still the middle of March.


Apply tree wound dressing to the last 3 growth rings.

If you must prune when temperatures are above 50 degrees or between April and October, cover the wound surface with tree wound paint immediately. Tree wound paint can actually slow the natural closing of the wound, so limit the use of wound paint to the situation described above.

In forests

In forests, site-specific oak harvest guidelines are used. To read the full set of guidelines for every type of forest site, refer to Guidelines for Reducing the Risk of Introduction and Spread. An interactive guide is also available; you answer a few questions about your specific forest site to get the most appropriate guidelines for that type of site.

For more information visit the following site:  http://dnr.wi.gov/topic/ForestHealth/OakWilt.html

 

 

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