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 Non-Natives Questions

Non-native Norfolk Pine suffering in Corpus Christi TX
August 02, 2011 - About ten yrs. ago I transplanted my Norfolk Pine into the ground in my backyard. With all the frosty weather of 2010/2011 the Spring brought a browning/dying of a lot of the Norfolk Pines in this are...
view the full question and answer

Non-native Sandankwa viburnum (Viburnum suspensum) damaged by freeze
April 16, 2006 - We live in Georgetown. My Sandankwa Viburnum seem to have been affected by the late freeze. There are now very few leaves and no flowers/buds. Should I cut the plants back, leave them alone, or giv...
view the full question and answer

Moving non-native globe willow in Ft. Worth TX
August 10, 2009 - I planted a globe willow in a small area in front of my house and it is probably going to need more space. Can I replant it in a more open area without killing it? It is about 8-9 ft tall, 2-3 ft of ...
view the full question and answer

Privacy hedge for Burleson, TX.
April 09, 2013 - I moved out to the country away from the hustle and bustle only to find that I have less privacy out there because of open land. I hear children screaming and dogs barking from 1/4 mile away. I want t...
view the full question and answer

Promoting growth on non-native dipladinias (mandevillia) from Point Pleasant NJ
May 26, 2011 - My Dipladinias were almost dead when I bought them last year, but after a little TLC, they blossomed like CRAZY in pots outside. They stopped blooming in November (I brought them into the house in Se...
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