trees covered in spider webs
Barklice are very popular this year in Houston. They are not true lice, they are considered a beneficial insect removing dead/organic matter. If the webs bother you, just blast it with a hose to remove them.
Here is link to our blog entry on barklice.http://agrilife.org/harrishort/2015/05/26/barklice-not-as-bad-as-you-think/#.VZFvTflVhBc
Thanks for the question.