Hi all - A few weeks ago I started to notice a marginal yellowing and necrosis on the lower leaves of my cherry tomatoes. It had been restricted to the lower leaves and although progressing I didnt think much of it. I did a round of Neem oil spray last week and that was it.

Earlier this evening i noticed that the leaves on the lower branches had gone from necrosis to wilting / dead. When i tried to remove the leaves the entire branch came off :( I had about 6 branches come off that way. One had even fallen by itself. I cut the branch open but seemed perfectly normal inside.

Any idea what this could be? Any and all help appreciated.