I would like to give a mid season report on the tomato varieties in my garden. I planted two gardens, one in my back yard, the other in a community garden plot. I planted Italian heirloom from two seed sources, Neaves Azorean Red (thanks to Carolyn for introducing this variety), Cherokee purple, Brandywine OTV (another Carolyn var.), a particularly productive strain of Brandywine pink, Moscow (popular locally in Utah), Marianna's peace, Julia Child, and Amana Orange.
The tomatoes in my community garden failed due to 2,4 D exposure. Those plants are still alive but the leaves are curled and they have not grown since. They probably will not produce this season. I lost a lot more varieties from that. Don't use 2,4 D anywhere near your veggie garden! And contrary to other threads on gardenweb, they will not grow out of the herbicide easily.
In my home garden, to date Italian heirloom is the only one to set fruit so far in these hot temps and has no sign of disease. There does seem to be some differences in the Italian heirlooms from the two seed sources. One source has produced smaller plants, but both are setting fruit. These naturally wispy foilage toms are doing well.
Neaves has lush robust foilage but few blossums and no sign of disease. Its probably one of the healthiest plants in the garden. I expect great things from this variety this year. I suspect that it may just be a later season variety than the others.
Brandywine pink is loaded with blossums but no fruit set yet and is showing signs of yellowing on the lower branches. Last year I had huge production from this strain. Other times I have grown brandywine pink the plants bearly produced.
Brandywine OTV has a medium amount of blossums and has no signs of disease. This one has done well in my soils/climate the past 3 years. I find it sets fruit later in the year than other vars.
Cherokee purple is smaller than the other plants but is healthy and has lots of blossums. This represents a change from years past when it was one of the earlier varieties and was one of the largest plants. I expect it to do well this season as it has in the past. No yellowing is seen yet.
Marianna's peace and Julia Child have no precievable difference between them so far and have less blossums than the Brandywine pink. Otherwise they look the same as the other potatoe leaved varieties. At the moment, I can't remember whether they are showing signs of disease. I will have to look when I get home.
Moscow has produced shorter bushier plants, but they are healthy so far but not as many blossums yet. Last year this plant crushed the tomato cages because they were so heavy with fruit. This year the harvest may be more modest.
Amana orange was started later this year so it is a couple weeks back from the others. So far so good, healthy and growing. This one is a somewhat later variety as well.
I will keep you posted as the season progresses.