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
1 rating

Thursday - August 21, 2008

From: Sugar Land, TX
Region: Southwest
Topic: Pests
Title: Webs on trees and porch
Answered by: Nan Hampton

QUESTION:

i have webs all over my semi covered porch in my back yard. i have noticed these small webs are also on the trees in my backyard. what are they and are they dangerous to the trees or my family who sit on our back porch.

ANSWER:

We aren't entomologists but we'll tell you what we know about webs around the Central Texas area. There are webworms (Hyphantria cunea) and there are tent caterpillars (Malacosoma americanum) that build webs in various species of trees. The webs enclose moth caterpillars that feed on the leaves. One of these might be a possibility for the webs in your trees, but aren't very likely to be what is on your house since there is no food there for the caterpillars. As for harm, they can damage your trees but don't pose a danger to you, your children or your pets.

Another possibility for webs on trees, generally on the trunk of the tree, are barklice (Archipsocus nomas). The bark lice, which aren't really lice at all but insects called psocids, are feeding on fungi, lichens and other debris on the trunk of the tree. In other words, they are cleaning your tree and, thus, are probably beneficial to it. They produce the web to protect themselves from wind, rain and predators. Since they feed on fungi, algae, lichen and such, it is possible that they could be feeding on these organisms that grow on your covered porch as well. The bark lice, like the caterpillars, are not harmful to you or your family, nor are they harmful to your trees and/or porch. Here are photos of bark lice.

I suggest that you contact the Fort Bend County Extension Service. They may have some insight about what is building webs in your area.

 

More Pests Questions

Tulip tree with white spots on leaves in Mississippi
July 31, 2008 - I have a tulip tree in my yard that blooms in the spring that is about 10-15 years old. However just this past week or so we have noticed that there is lots of white spots on the leaves and the branc...
view the full question and answer

Using Dormant Oils in the Winter
January 20, 2015 - What are your thoughts on the use of dormant oils as part of a winter maintenance program? I live in Austin, Texas.
view the full question and answer

Watering oaks in Houston, TX.
June 07, 2011 - Our yard (Real County, TX.) has many oak trees. We never water these trees, but I wonder if you recommend watering during this extreme drought. The trees look very stressed and are covered in ball m...
view the full question and answer

Ravaged by snails
May 23, 2007 - Our Prickly Pear Cactus is being completely ravaged by snails. Is there something in my yard that could be attracting them? Is there something I can do to keep them off the plant? Also is is safe to...
view the full question and answer

Organic means for ridding garden of stinging ants
April 18, 2008 - Dear Mr. Smarty Pants, I have a butterfly garden that is filled with native plants the butterflies LOVE! However I have a colony of red ants that have moved in. I need to trim some of the more inva...
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