These plants looked devastated. Stu Koretz supplies the ID: "The beetles on the Yerba Santa were Trirhabda genus:
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These are metallic green as larvae and green with yellow longitudinal stripes as adults. The same individual plant has had many of these guys for several years in a row, so it's good to remember to look when you pass by on your way up the fire road." Near the intersection of Roads D, E, and F.