En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Cottony infestation on Turk's Cap in Austin

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
1 rating

Monday - July 05, 2010

From: Austin, TX
Region: Southwest
Topic: Diseases and Disorders, Herbs/Forbs
Title: Cottony infestation on Turk's Cap in Austin
Answered by: Barbara Medford

QUESTION:

The Turks Cap in my front planter is well-established and, overall, happy and blooming. However, some of the top leaves, those in the most shaded area, have what looks like a thin, loose layer of cotton. These leaves are also a bit puckered. Any suggestions as to what this is (a mold, perhaps?) and what, if anything, needs to be done to remedy the situation? The planter also contains a couple of medium size(>two story) live oaks, wedelia, Tx. mountain laurel, purple oxalis, cedar sage, rock daisies, flame acanthus, dwarf ruellia, winecup, and evening primrose. Your help is greatly appreciated

ANSWER:

Generally, the Malvaviscus arboreus var. drummondii (wax mallow) is a pretty tough, well-adapted plant for our area, and not much bothered by pests and diseases. There are three insect pests that can disturb it, creating various symptoms of the presence of the pest, one of which might be the "cotton" you are seeing on the leaves. Go to the websites indicated to see the symptoms, matching them up with your observations, and find a treatment that seems reasonable to you in the situation. Given the area where you are seeing this cotton, we would suggest that you trim back the area of the Turk's Cap that seems most affected. Since you have already observed that it is worse in the most-shaded area, and since you can prune Turk's Cap nearly all year long and not damage it, we would certainly suggest that you trim that out of the shady area, and dispose of it so whatever bug is causing the problem will not get an opportunity to spread somewhere else. 

Aphids: these will definitely cause leaf curl, and the honeydew they excrete begins as a whitish area, although it can develop a black fungus that will change the color and is really ugly. University of California Integrated Pest Management Aphids

Spider mites: this is probably the best suspect in your case, as the spider mite is a member of the Arachnid (spider) family and has web-spinning abilities. Again, from the UC IPM program Spider Mites

Mealy bugs: these individual bugs can also have a cottony appearance, and you can find some easy control methods in this eHow site How to Control Mealybugs.

From our Native Plant Image Gallery:


Malvaviscus arboreus var. drummondii

Malvaviscus arboreus var. drummondii

Malvaviscus arboreus var. drummondii

Malvaviscus arboreus var. drummondii

 

 

More Herbs/Forbs Questions

Native plants both deer resistant and good for erosion from North Oaks MN
August 23, 2012 - We have several partially sunny areas on hills that are prone to both deer and erosion. Our goal is to reduce runoff in an effort to preserve the watershed that provides tap water to many citizens of ...
view the full question and answer

Survival of wildflowers after Hurricane Irene in Perkasie PA
September 03, 2011 - Mr. Smarty Plants, We have (had) a beautiful row of wildflowers and sunflowers along the one side of our house. Now that Hurricane Irene has passed, most of the flowers are matted down from the wind...
view the full question and answer

Wildflower Meadow for Poth, TX
January 22, 2014 - I recently cleared some underbrush from a virgin pasture, with large oaks and mesquites scattered through it, and was wondering if it was too late to plant wildflowers? If not, what varieties of wildf...
view the full question and answer

Dietes bicolor invasive from Brisbane Australia
April 01, 2013 - We have dietes bicolor growing in our garden. I am changing the type of garden and cannot seem to kill it. I've dugged it out, spent too many weekends pulling out every new shoot, used poison, but t...
view the full question and answer

Light requirements for Heartleaf Skullcap from Smithville TX
June 29, 2011 - How much sun or shade does Heartleaf Skullcap need?
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
© 2014 Lady Bird Johnson Wildflower Center