 The case will be heard by a federal judge in Baton Rouge. A caterpillar called Fall Webworm seems to have a bigger population this year, and they are out earlier. They like to munch on leaves. LSU AgCenter urban entomologist Aaron Ashbrook says in heavy wooded areas, the damage can go unnoticed. However, you know, in backyards in the city where we're relying on trees to provide shade, that damage can become much more noticeable as they're increasing heat in those environments.