Please report on your findings with the 3 dif rootstocks. Great experiment.
I’m not a fan of having to use hybrids to accomplish blight survival. I plan to use some uber vigorous non-hybrid winter squash as a rootstock for cukes for similar reasons. Are you (or anyone else) grafting veggies besides tomatoes?
I did the top graft but apparently used the clips for side grafting - it was what I had. I also recently got the 2.5mm clips and will give them a go this weekend with more top grafting of tomatoes. The clips in the picture will likely do better for the cukes than the 2.5 mm.
The tomatoes that didn’t get grafted have grown quite tall as I mentioned above. I’m thinking I can find someplace at the top of the plant that will match my rootstock diameters. The 2 trial plants that took were my ‘main’ tomatoes, but the ‘early’ one didn’t. So I have a large ‘early’ tomato plant that I can snip the top off of and give it another try.