plants are dying from the bottom after reveging

i took a few small females and cut large center colon and left bottom to reveg/.ithey reveged fine but now they are turning brown from the bottom up/ what do i do to stop this?it seems the old bud growth died back eventually killing that branch.its working its way up the plants

sorry i guess i put this in the wrong place---havent been here in a yr r so sorry

Looks like you have a mite or thrip infestation judging by the white stipling on your leaves. Could be your problem right there.

Clean all of that dead old growth off. That is a breeding ground for mold

usually those turn out to be a low yielding popcorn plant,good luck