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
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

Spots on calycanthus petals from Buckley WA
June 20, 2013 - Petals on calycanthus develop black spots the turn into holes. Problem appears shortly after buds open. Occurs every year. Foliage is healthy. Plant growing well and doubles or triples size every ...
view the full question and answer

Identification of insects on crepe myrtle in Florida
May 22, 2013 - I have large colonies of striped bugs on large crepe myrtle in my backyard. They stay in large groups and have long antennae. There are larger black bugs among the groups that appear to corral and g...
view the full question and answer

Spots on persimmon tree leaves from Dripping Springs TX
July 10, 2013 - We are in rural Hays County Texas off Hamilton Pool Rd Texas. Large persimmon trees are turning yellow, blackish spots on underside of leaves. What do we do?
view the full question and answer

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

Long term effects of pesticide from Lubbock TX
March 20, 2013 - I have 9 western pecan trees about 20 years old. Trunk sizes is from 18" to 39". I used a product Bayer Tree and Shrub, applied to the trees. I wonder what it will do to the trees. I talkd to Bayer ...
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