|Scab lesions on Mandan pecans|
Once the rains kicked in this summer, I was able to find scab lesions on our Mandan nuts (photo above). Finding that Mandan is susceptible to scab does not surprise me. I found scab lesions on Mandan twigs shortly after we grafted this cultivar into our orchard back in 2011. To me, Mandan seems to be similar to Pawnee in terms of susceptibility to pecan scab.
Scab can be controlled on Mandan with a fungicide program but the kernel quality issues I've seen with this cultivar will prevent me from propagating additional trees.