Subject: Large cocoon like spider web
Geographic location of the bug: Baldwin, Maryland
Time: 01:42 PM EDT
Your letter to the bugman: I was wondering if you could tell me what kind of cocoon or web this is and what is inside it?
How you want your letter signed: Thank you, Michele
This appears to be a web full of Fall Webworms, Hyphantria cunea. Here is a BugGuide image of the caterpillars that are inside the web. According to BugGuide: “About 120 species of hardwood trees have been recorded as larval hosts. In the north, common hosts include alder, apple, ash, birch, Box-Elder (Acer negundo), cherry, elm, mulberry, poplar, willow. In the south, common hosts include ash, hickory, maple, mulberry, oak, pecan, poplar, redbud, sweetgum, walnut, willow; preferences for different host plant species appear to be regional and seasonal.”