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

Wednesday - August 07, 2013

From: Newport, RI
Region: Northeast
Topic: Non-Natives, Diseases and Disorders, Pests, Shrubs
Title: Possible maple scale on non-native mophead hydrangeas from Newport RI
Answered by: Barbara Medford

QUESTION:

I have a mophead hydrangea that has small white cottony tufts under the leaves and on the stems. I believe this is maple scale. Is there a home remedy I can use to rid this disease?

ANSWER:

There are 4 members of the  Hydrangaceae family in our Native Plant Database, indicating that they are native to North America. They are: Hydrangea arborescens (Wild hydrangea), Hydrangea cinerea (Ashy hydrangea), Hydrangea quercifolia (Oakleaf hydrangea) and Hydrangea radiata (Silverleaf hydrangea). Hydrangea macrophylla, (Mophead hydrangea) is native to China and Japan and therefore out of our range of expertise. However, we know that many are grown in the United States and some Internet research turned up some information that will perhaps lead you to a solution to your problem. In response to your question, no, we do not know of any "home remedy" for your problem, and in fact, don't know for sure what your problem actually is. Because local gardeners are more apt to know about locally grown plants, we suggest you contact the University of Rhode Island Cooperative Extension Office to learn if others are experiencing the same difficulties. Then, follow these links to other university and national sites on specifics of the problem:

University of Rhode Island Master Gardeners

Alabama University Cooperative Extension System Diseases of Hydrangea.

United States National Arboretum Pests and Diseases of Hydrangea macrophylla

Washinton State University Extension Scale Insects on Ornamentals

 

From the Image Gallery


Wild hydrangea
Hydrangea arborescens

Oakleaf hydrangea
Hydrangea quercifolia

More Pests Questions

Aluminum foil disorienting insects under plants from Brierfield AL
April 20, 2011 - Does covering the ground under plants frequently attacked by flea beetles with aluminum foil really disorient the insects? But does it also disorient beneficial insects?
view the full question and answer

What's attacking my Nellie Stevens Holly plants in Iredell, TX?
June 27, 2011 - I just bought 10 Nellie R. Stevens holly bushes and planted them as a screen. The leaves on some of the plants are at least half white - not yellow but white. Apparently they were like that when I b...
view the full question and answer

Problem with Prosopis glandulosa (Honey mesquite)
February 27, 2014 - One of our mature Honey Mesquite trees is losing thumb sized branches high up in the canopy because something is stripping the bark. The branches are completely white for 8-12 inches. Of course the ...
view the full question and answer

Wasps on live oaks from Sinton TX
August 20, 2012 - Wasps on my live oak trees. What is attracting them? Does this hurt the tree?
view the full question and answer

Dealing with beetles feeding on cholla cactus
June 20, 2010 - Hi Mr. Smarty Pants, I bought a Cylindropuntia imbricata from the Wildflower center and it was growing like crazy. I recently noticed a lot of beetles feeding on it. Some are black and some are gra...
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