why are the skin of my walnuts turning black?
You haven't said whether they're turning color on the tree or after dropping from the tree. Black walnuts normally turn black as the skin matures, dries up. It's more typical that this change occurs after the nuts drop from the tree. There is a pest called the husk fly whose larvae feed on husks and these can cause husks to turn black prematurely, while still on the tree. The main problem with husk flies is that they cause dark staining on the nut shells, which is a problem in commercial crops, but usually tolerable in backyard crops, where appearance is not a big issue.
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