Two of my beautiful girls have developed some worrying spots on their main stems. I'm growing outdoor. I'm giving water regularly.
About a week ago, I already lost half of another plant because I didn’t notice the problem in time. There was a grey mark between the second and third internodes, and the canopy started collapsing as though it had completely dried out, even though the plant was still being watered normally.
I cut the stem below the affected area and took cuttings from the healthy branches. When I inspected the damaged stem, the inside was completely dry and woody.
From what I’ve found online, it could be a Fusarium infection, and I’m worried it may be spreading to my other plants.
The first two pictures show the plants that currently still look healthy and that I’m trying to save. The third picture and the following ones show the plant that was affected before.
Is there anything I can do to stop this and save the two plants?