Arisaema disease

Just wondering if anyone can shed some light on the possible truth that the native species of Jack and the pulpit can spread disease to the more exotic members of the genus?
I used to have multiple´groups of A. sikokianum grown from seed and a clump of A. ringens that was over 3 foot tall.
One spring the ringens just didn't reappear and the few ratty sikokianums that appeared had orange pustules on their foliage. No problem with the native triphyllum 10 feet away in some cases.
There are voles in the garden but the triphyllum comes up fine...just wondering if anyone can shed some light on this...zone 6A garden in mid state CT..

Thanks
Anton




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