My semi-dwarf peach tree died last year and I want to put
another fruit tree in the same spot.

I think it might be a mistake to put another peach there, in
case there's some disease peculiar to peaches still present in
the soil.

I need something self-pollinating as I don't have room for 2.
Right now I'm considering a prune plum. Anyone got any
comments/ideas?

BTW, I'm in zone 5 in eastern WA, and in an apple maggot control
area.

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Where ARE those Iraqi WMDs?