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?


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


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.


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

Landscaping for slope in Kansas City
October 08, 2008 - We have a down sloping back yard and patio on the lower area. We need some water absorbing plants near the foundation and some in the front of the house, where water isn't a problem. We are allergic ...
view the full question and answer

Mites in soil of house plants
June 25, 2008 - Hi there! I recently noticed tiny silver mites in the soil of my plants that I only notice after watering. These plants are indoors in on a window ledge (a dwarf palm, aloe plant and Hawaiian Scheffle...
view the full question and answer

What insect eats Alamo Fire blue bonnets from League City TX
June 10, 2013 - What insect eats Alamo Fire blue bonnets? Something seems to be eating new seedpods.
view the full question and answer

Carolina buckthorn and Neem Oil Spray Damage
April 27, 2015 - It's April, I have a Carolina buckthorn that seemed to be doing well, about 8 feet tall, about 2 years old in part shade. It was putting out new leaves about a month ago and seemed to have infestati...
view the full question and answer

Why are the eastern red cedars in Bastrop/Travis County turning brown?
May 11, 2009 - I live on the Bastrop/Travis county, TX line and have many eastern red cedars on my property. About 10 of them are dying and it has happened quickly with the onset of the warmer weather. I noticed d...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
© 2016 Lady Bird Johnson Wildflower Center