Black leaves on new growth

Troubleshooting
1

Does anyone have any idea what this is?

I have a mix of autoflower strains (white widow, ak47 and bubble gum). Outdoor grow. About 20% of new growth (bud sites?) shows black in the leaves. It does not rub off, it’s part of the leaves.

ThanksProcessing: 6A264B87-1EC8-4CB0-B2F1-5BD228646288.jpeg…

2

Your picture didn’t quite get uploaded. Need to wait until the photo is uploaded and then hit go.

3

Here it is again. What’s up at the lab? To many to be a coincidence i think not.