It is fusarium wilt. The other varieties may be more resistant than Delicious which I was unable to grow successfully until I started grafting. Some of the heirlooms and open pollinated varieties are especially susceptible to fusarium wilt and others are less affected. Luckily you live far enough north that your colder winters should keep it in check unlike down here where winter is rarely cold enough to slow down fusarium so it gets worse from year to year. This area used to be famous for growing some great tomatoes but over time the fusarium problems got worse and worse causing commercial growers to resort to ever more resistant hybrids until now they grow the same things you see in the supermarkets.
Bill
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