What is this red and black bug on my avocado tree leaf?

Post date: 2021-05-08 15:19:09
Views: 93
I have 2 small avocado trees in my backyard in the San Francisco Bay Area (each less than 5 feet tall). Today I noticed a mostly black, with some red, insect on a leaf of each tree; when I started pulling one off, one end of the bug seemed to stick to the leaf. I've uploaded a picture of it. What is it? Is it bad for the trees?
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