HELP!!

Hi thanks in advance for anyone who takes the time to check this out and offer assistance! Have 2 photoperiod pretty ladies in pots outdoors (Purple Kush) that are winding down in late flower. beautiful heavy colas and everything has been almost perfect throughou. Over the past week I’m getting some ugly on a bunch of leaves. I’ve included a picture of the worst ones I plucked this evening. i would like to know what this deficiency looks like to more experienced growers! I’m not even sure I should worry this late in flower but it would be nice to know