I've not experienced complete Fusarium resistance, with heirlooms or hybrids - if it is there, it impacts the plant eventually. I find it varies seasonally, as well as location in the garden as well.
All I can say after all my years of growing many varieties is that a few seem to have more staying power - I've had very good luck with Aker's West Virginia, Andrew Rahart's Jumbo Red, Red Brandywine, Rasp Large Red, and Cherokee Purple - meaning that when plants near/around them are going down with F, they last moderately to significantly longer. (this isn't a complete list, but they are the ones that come to mind).
The flip side is that many really struggle, and in fact, can go down prior to even one ripe fruit - that list is much longer, unfortunately, for my main Raleigh garden...though again, varies by season and location.
I can barely get Yellow Pear or Green Zebra to fruit at all, even when grown in a bleached pot with fresh soil.
__________________
Craig
|