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

Saturday - April 30, 2011

From: Austin, TX
Region: Southwest
Topic: Pests, Shrubs, Trees
Title: Holes in leaves of wax myrtle from Austin
Answered by: Barbara Medford

QUESTION:

I just purchased 4 of the 5 gallon Wax Myrtles at the last spring plant sale and after planting them, they are getting eaten by bugs leaving holes in the leaves. I can't find any of the bugs doing the damage. What would be good to spray on these wax myrtles for insect control? Thanks!

ANSWER:

Water. And if that doesn't work, add a little pure liquid soap to the water, and spray again.

Okay, now we've had our fun, we'll get serious. We are neither entomologists nor plant pathologists, but our experience as gardeners tells us this is probably aphid damage. Look on the underside of the wax myrtle's leaves-do you see tiny white specks moving around? Are there ants present? Is there a whitish deposit on those undersides, some of which may be developing a black moldy appearance?

Sooty mold is a fungus, or more commonly a complex of two or more fungal species, that grows on honeydew or on plant exudates. Honeydew is a waste-product of aphids and other plant-sucking insects. As honeydew is excreted by sucking insects, it falls and coats any surface upon which it lands. Sooty mold fungi invade and live upon this sugary coating. These fungi do not infest the leaf ifself. Thus, sooty mold may often be found growing on any exposed surface beneath aphid-infested trees and shrubs. Sooty mold can cause great harm to plants, however, by blocking sunlight to the leaf surface below and diminishing photosynthesis.

Sooty mold can often be successfully removed by rinsing with water from a garden hose. However, this will be most effective after the aphids or other honeydew-producing insects are destroyed. Sometimes sooty mold development is so severe and persistent that only time and exchange of leaves through the growing seasons will remove it all.

Aphids are not especially difficult to control and non-chemical methods are usually very effective. Insecticidal soaps are often the remedy of choice for many gardeners. Various brands of insecticidal soaps may be found at just about any retail nursery or garden center. Be sure to read and carefully follow all label directions when using any pesticide, organic or chemical.

 

 

More Trees Questions

Evergreens for a deer corridor in MI
April 16, 2012 - I am growing three rows of evergreens for a wildlife, deer travel corridor, and am looking for which trees grow well together and are shade tolerant of each other when planted at the same time, or at ...
view the full question and answer

Wispy plant to put behind a waterfall
May 30, 2008 - Needing a 10-20ft wispy ______ to plant behind our waterfall to help block out road noise. We live in Austin. I've looked at the Mexican weeping bamboo but are there other options?
view the full question and answer

Controlling Tree Roots in Sewer Lines
July 16, 2014 - We had a leak with our underground pipes near the meter box - the pipes are at least a foot or more underground. My plumber poured table salt on the pipes to deter roots from a nearby tree from gettin...
view the full question and answer

Galls on live oak trees in Austin, TX
April 14, 2005 - I am a resident of a condominium complex in Austin that has numerous Live Oak trees. Can you explain what the gall type things are hanging from the trees at this time of year and all over the grounds?...
view the full question and answer

Pruning lower branches of Cordia Boissieri from San Antonio
December 08, 2013 - My Texas Wild Olive Tree is about 6 feet high now. I bought it at the 2012 plant sale. This past summer it put on new branches near the base of the tree which I would like to cut off (to encourage u...
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