These shallow channels looked like they might have been cut by a woodworker’s router. But they were cut — or I should say chewed — by Longhorned Borer beetle larvae, feeding on the cambium of a eucalyptus tree.
The tree was across the trail in Rivas Canyon. Not unlike the fallen oak on Rocky Peak, Southern California’s multi-year drought likely weakened the eucalyptus, making it susceptible to other pests.
The Rivas Canyon Trail connects Will Rogers State Park to Temescal Canyon. Today (and last weekend) I ran it as part of a long loop from the “End of Reseda” at Marvin Braude Mulholland Gateway Park.
Some related posts: Will Rogers – Temescal Loop, Will Rogers Western Ranch House, Downtown Los Angeles and San Jacinto Peak
Images taken on trail runs, and other adventures, in the Open Space and Wilderness areas of California, and beyond. All content, including photography, is Copyright © 2006-2020 Gary Valle. All Rights Reserved.