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I think dirt has nutrients, the worm sorts out what it needs, and gets rid of the rest.
Worms
To get rid of inch worms on trees, there are a variety of methods to get rid of the worms. You can try bus sprays and insect repellants for instance to get rid of them.
they eat
By not killing it
I need to get rid of worms that are eating my pygmy date palms.
It eats dirt. Worms get all their nutrients from dirt.
earth worms
dirt
Both.
probably dirt.
i am not sure but i am guessing that it would be because worms go though dirt and who knows whats in the dirt where the worms go.