Warm weather means early start for oak wilt threat
Posted: 1:32 AM Apr 6, 2012 Reporter: Associated Press
The Michigan Department of Natural Resources says the time period for the transmission of oak wilt from diseased to healthy red oak trees has started early because of the unseasonably warmer temperatures.
DNR forest pest expert Robert Heyd says oak wilt is a serious disease that kills red oaks within a few weeks of becoming infected. White oaks are more resistant, and the disease progresses more slowly in them.
Heyd says the "normal time-tested advice is to prevent oak wilt by not pruning or otherwise injuring oaks" from April 15 to July 15. He says the warning applies earlier this year.
Beetles move spores from fungi on the previous year's oak wilt-killed trees to wounds on healthy oaks.