Yes, frass. Otherwise known as insect poop. In this case caterpillar poop. Each day about six cabbage moths hang out on my broccoli, and I pick about 14 caterpillars off the leaves. Just as I was about to do something drastic, I observed a wasp on the underside of the leaves. Two frogs are hanging out. When I dropped a small caterpillar to the ground, a group of ants made short work of it. And we've got spiders, too. I've got my own little ecosystem in a veggie patch. I am happy that the insect predators are happy to live there.
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