En Español

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

Please forgive us, but Mr. Smarty Plants has been overwhelmed by a flood of mail and must take a break for awhile to catch up. We hope to be accepting new questions again soon. Thank you!

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

Identity of small objects that look like tiny pecans
November 14, 2013 - Dear Mr. Smarty Plants, I am doing my science fair project on acorns. Last year I measured how many acorns and other nature-y stuff fell into a baby pool from a live oak tree in my backyard every ...
view the full question and answer

Need help with powdery mildew and mites in Bastrop, TX
July 26, 2011 - I tend to flower beds for the city. I have noticed a powdery mildew in 2 beds. It is on the Pavonia and Turks caps. I now notice mites. What should I do?
view the full question and answer

Worms on blackeyed susans and daisies in Tuckerton NJ
July 30, 2009 - I have black eyed susans and white daisies planted together. Not sure if this makes a difference. Today I noticed that there are tiny worms on both the plants they are almost the size of silk worms. ...
view the full question and answer

Larvae infesting Mexican white oak
December 16, 2010 - What larvae/worm would dwell and eat the inside of a Mexican White Oak? I planted one last November and it was doing great. The bark started cracking towards the bottom but the top was very full & gre...
view the full question and answer

Problem with mesquite tree limbs
June 13, 2014 - i keep finding some smaller branches of my mesquite tree in the turf area around the tree. when looking at the cut ends, they appear to have a smooth cut around the circumference of the limb about 1/...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | JOBS | SITEMAP | STAFF INTRANET
© 2016 Lady Bird Johnson Wildflower Center