What’s eating entire leaves off entire branches of Mirabelle Plum

Question

In June, starting at the top, something systematically ate all the leaves along the top branches of on of my mirabelle plum trees. In July, this something ate the middle section off the 2nd mirabelle plum tree. The mirabelle’s are separated by a different type of plum tree in between the two, that has been untouched by this leaf eating thing. Also, the grape and cherry trees on the other side of the mirabelle’s have not been touched. All these trees are espaliered along our fence. It must happen at night because I can’t find anything. I live in Menlo Park CA 94025.

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Answer 1

It seems likely that it is either a caterpillar or a moth. There are many options available, and many of those can be crafted using items that you already have.

This collection of articles will help: https://www.gardeningknowhow.com/special/organic