Are willow oaks less susceptible to leaf scorch?

Asked October 5, 2016, 6:14 PM EDT

Hello, we are taking out a red oak that has BLS. Will a willow oak planted in its place be ok?

New Castle County Delaware

3 Responses

Thanks for your BLS question. Three sources (The American Phytopathalogical Society, Virginia State University and the National Arborists) confirm that the willow oak (Quercus phellos) is highly susceptible to BLS, so planting one is not advised.

University of Delaware Extension suggests that "Some trees more resistant include black gum, beech, buckeye, linden, and Zelkova."

Hope this is helpful!

Thank you.

Is it ok to plant an 8-10 ft Zelkova this time of year in Wilmington?

Thanks,
Tim

Thanks, Tim. Fall is the time to plant/transplant perennial plants. The USDA map says Wilmington is zone 7a (average lowest winter temperatures 0 to 5 degrees F.) The United States National Arboretum indicates that Zelkova serrata (Japanese zelkova) can tolerate temperatures down to -20 to 10 degrees F (zone 5), so those sources would indicate it is not too cold for them to survive there.

Good luck!