What's happening to these stems?

[Pereskiopsisdotcom]

I've never had this happen before. Stems are drying up from the bottom or shriveling up and flopping over. I'm using Mycorrhizae Growing Mix for the soil with additional perlite and diatomaceous earth for aeration. This is happening under LED, T5 and windowsill cacti in different rooms so I'm thinking it has something to do with my home, the soil, or something has attacked my collection. Any feedback to save what I have left would be much appreciated.

[mikethecactusguy]

sometype of infestation. check the roots

[hegar]

It looks like your root stock has died. This is most likely due to root rot, which is moving up to the scion material grafted on top. The best thing to do now is to cut the grafted tops off, before the infection has reached them. You can then either let the still healthy cacti form roots or you could graft them onto another root stock.

Harald

[Shane]

I had this happen to some Pereskiopsis cuttings that were in rough shape when I planted them. Not sure why it happened. Most from that batch were fine

[Pereskiopsisdotcom]

Thanks for the advice everyone.

It's been happening over the course of a couple of months now and seemingly haphazardly to random grafts. I have quarantined those that are affected and will be doing a deep clean of my grow shelf with bleach. When I do that I will check the roots to see what might be going on. I've read about the hot bath method.

I also have a couple of fans ordered because I really haven't had much air circulation in the room and with summer coming it's about to get a lot hotter in my old house.

[SoilSifter]

Perhaps the mycorrhizal fungi weren't entirely beneficial for Pereskiopsis.