En EspaŅol

Q. Who is Mr. Smarty Plants?

A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.

Help us grow by giving to the Plant Database Fund or by becoming a member

Did you know you can access the Native Plant Information Network with your web-enabled smartphone?

Share

Ask Mr. Smarty Plants

Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

Search Smarty Plants
    
 
See a list of all Smarty Plants questions
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.
Need help with plant identification, visit the plant identification page.
 
rate this answer
Not Yet Rated

Thursday - March 18, 2010

From: flagstaff, AZ
Region: Southwest
Topic: Diseases and Disorders
Title: Need help with canker in willows in Flagstaff, AZ.
Answered by: Jimmy Mills

QUESTION:

We've got a lot of willows in high altitude desert conditions, irrigated. They've got canker and I want to know if there's anything I can paint on the pruning wounds when I go around trying to remove infected branches. otherwise I'm afraid of the pruning wounds just being new avenues for infection.

ANSWER:

You don't mention the kind of willows that you have (there are 55 species of Salix in our NPIN Data Base), but many seem prone to having canker problems.

Lets look at the pruning paint question first, and then I'll provide some links that might helpful in dealing with the canker problem.

In the past, applying pruning paint to pruned branches was generally thought to be necessary to prevent infectious diseases and infestation by insects. The current thought is that in most cases it is not necessary, and that it may cause more harm than good. Here are a couple of links that support that idea.

Aggie-Horticulture

Tyler Trees

This Bulletin from the  Integrated Pest Management Program of the University of Illinois Extension, and this report from the University of Florida have some good information about canker in willows and the fungus that causes it.

 

 

More Diseases and Disorders Questions

Lantana in hanging basket not blooming in Dover PA
June 23, 2010 - We have a lantana Bandana trailing gold in a hanging planter in full sun. It hardly blooms. Any suggestions?
view the full question and answer

Dying leaves on Autumn Blaze Maple tree in Littleton, CO
May 25, 2012 - I have an autumn blaze maple where for the last two years the left side of the tree turns light green, then brown, and leaves die. The right side is dark green, normal. Is this a water over/under pr...
view the full question and answer

Browning leaves on Ilex vomitoria in Houston
July 02, 2009 - Houston, we have a problem!!! I have a number of yaupon bushes that have been in my yard for years that have a large number of leaves turning a solid dark brown color. Any ideas of the cause?
view the full question and answer

Are Ashe Junipers dying from mite damage in Austin?
August 08, 2011 - If Ashe Juniper needles are turning brown and dropping off the trees because of drought, and not disease, do the needles ever come back, or have the tree limbs died? What if the cause is mites, not ...
view the full question and answer

Browning leaves on recently planted chinkapin oak in Rockwall TX
June 09, 2010 - I just planted a chinkapin oak that is about 1 1\2 inches thick last week and now some of the leaves are turning brown. Does that mean its dying? Do you have any tips that I could use to protect it?
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP | STAFF
© 2015 Lady Bird Johnson Wildflower Center