Walnut tree worms

Asked August 5, 2017, 10:38 AM EDT

My large pecan trees have walnut tree worms. What is the best option to eliminate them

Worcester County Maryland

3 Responses

Would you be able to send us photos so we can see what you might be dealing with? Are you finding worms on the foliage of the tree or inside the developing nut? There are other caterpillars that are active now, such as fall webworms, which do feed on pecan trees. Pecans are one of their preferred host plants.

Take a looks at the following resources from University of Georgia and LSU and see if this is what you have.




this photo of worms. I noticed first on trunk of tree and then black droppings. After several weeks large number of worms fell from the tree.

Thank you for the photo. This is a walnut caterpillar (Datana integerrima). http://bugguide.net/node/view/3234 They have one generation per year here. If they are dropping from the tree now, they are nearly finished feeding for this season and seeking locations to pupate and turn into the adult moths. We do not recommend any control.