Brandy Boy has some disease tolerances that, as far as we know,
Brandywine does not (not documented, anyway). The point of
dehybridizing it would be to get a plant very much like Brandy Boy
itself that comes true from seed (seed saved from last year's plant).
One would not really know that the disease tolerances were
in the resulting OP after several generations of selection from growouts
unless one had those diseases in one's own garden, but we have so
many members here, for example, that have verticillium, fusarium,
and/or root-knot nematodes in their gardens and fields that it would
be straightforward to find out which of those disease tolerances were
preserved in someone's Brandy Boy OP variety.
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