The Cottonwood thicket beyond the fencing is evidently well-stocked with the egg masses. I spotted fourteen from the path. I could reach about half of these with a stick taken from a pile of trimmings.
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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Backyard and Beyond 
Thank you for identifying these egg masses and destroying them. Invasive species are a serious threat to the native ecosystem. Thank you for your stewardship!