These look like Fall Webworms, Hyphantria cunea. Bugguide says they are found in northern Mexico but I imagine they could migrate south. They don't care much about our borders ;-). Walnut is a known larval host. See what you think: http://bugguide.net/node/view/453
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Thank you Forest Dragon for the ID and the link.
These look like Fall Webworms, Hyphantria cunea. Bugguide says they are found in northern Mexico but I imagine they could migrate south. They don't care much about our borders ;-). Walnut is a known larval host.
See what you think:
http://bugguide.net/node/view/453