Pears are quite capable of parthenocarpy under the right spring
conditions. If days in early spring are warm and sunny, many varieties
will bear a full crop of seedless fruit. When S. CA had a commercial
Bartlett industry some growers didn't even plant other varieties in their
orchard according to Childers in his classic "Fruit Science".
I suspect that this is the reason for confusion over what varieties are
self-fruitful- it all depends.
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