North American Native Plums Black Knot resistance

    I have spoken with my father over this past Winter and he has decided that he wants to plant a plum tree. Based on what I have learned from a video on growing plums by Aaron Thatcher on YouTube, it seems that European plums of Prunus domestica or Prunus cerasifera parentage are highly susceptible to black knot fungus.
https://www.youtube.com/watch?v=ij1FY8jK3_E
    One of the solutions in dealing with black knot fungus that Aaron mentions in the video is by growing North American native species of plums that have a natural tolerance to black knot fungus. The main problem with most species of North American plum is that they tend to sucker readily and form thickets. This may make harvesting the ripe fruit difficult using conventional harvesting techniques. Regardless of the suckering habit, if I want to grow plums without worrying about them dying from black knot fungus, I'm going to need to plant a North American species of plum with a natural resistance. I have seen the fungus growing on cherry trees in my neighborhood so I know the disease is present where I live.
    In my part of Ohio near Dayton, the only species of plum recorded growing in Greene and Montgomery counties in Ohio is the American plum (Prunus americana). Out of all the species of North American plum I can find information about, this species seems to be the most likely to form suckers and spread thickets. Another promising species of plum, although not native to my region in Ohio, is the Mexican plum (Prunus mexicana). Unlike P. americana, P. mexicana is not supposed to form thickets as readily and more often forms a single trunk when maturing.
    I have tried to find information on any potential improved cultivars of the previous two plum species, but so far I have not found any information on cultivars specifically bred for improved fruit production. I am hoping some more experienced gardeners on this forum might be aware of the existence of any improved cultivars of American plum or Mexican plum developed for fruit production. If there are no such cultivars available, I would like to learn if anyone has had enough experience foraging for these wild plums to know how resistant wild plants are to black knot fungus. If anyone can confidently identify a wild North American plum showing potential resistance to black knot fungus, I would be happy to trade seed for some fruit pits from the tree. Preferably, the plum seeds should be from one of the two species I mentioned, but it can be from any native North American plum as long as it shows black knot resistance and is adapted to the climate of southwest Ohio.

chickasaw plum is similar to American plum. Also tends to form thickets.

I find that if I mow around them, the suckers can be managed. Now if you let it go feral for a few years, that would be different story.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://plants.usda.gov/plantguide/pdf/pg_pran3.pdf&ved=2ahUKEwiFy5iBmazpAhXfHjQIHSKHDdEQFjAAegQICRAB&usg=AOvVaw1LKwUAR1wEFnRrtsH8cpYj

Blank knot not listed as problematic.

J Davis wrote:chickasaw plum is similar to American plum. Also tends to form thickets.

I find that if I mow around them, the suckers can be managed. Now if you let it go feral for a few years, that would be different story.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://plants.usda.gov/plantguide/pdf/pg_pran3.pdf&ved=2ahUKEwiFy5iBmazpAhXfHjQIHSKHDdEQFjAAegQICRAB&usg=AOvVaw1LKwUAR1wEFnRrtsH8cpYj

Blank knot not listed as problematic.

If you are able to collect pits from the fruit later this year, let me know. It may be difficult for me to find wild plum seeds/pits where I live.

I’m a couple years late, but happy to see others focusing on North American native plums. I’m in search of Mexican Plum (prunus mexicana) specifically and keep coming up empty. Apparently it’s fallen out of favor with landscapers, so it’s not commonly in stock in big nurseries. I’ve yet to find it in a small nursery either.
I’m looking for native plum pits to trade, or even saplings if possible. If you happen to have Chickasaw plum pits, I’d like to ask you for a few too. Let me know if you have pits and if you’d like me to pay for shipping to Texas or if you have something in mind you’d like to trade for.

According to the Lady Bird Johnson's Wildflower Center website the seeds of Mexican Plum (prunus mexicana)are available from their seed bank.

https://www.wildflower.org/plants/result.php?id_plant=prme

And also the Mexican Plum (prunus Mexicana) is on display at several locations including the Wildflower Center.

When we were looking for the Chickasaw Plum there were several nurseries that offer the trees.