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["Lon J. Rombough" <lonrom@hevanet.com>]

Beach plums (P. maritima) seem to have a mechanism for resisting PC by encapsulating the egg in a drop of sap that quickly hardens.  I've seen fruits of this species where most of the fruits had a little drop of hardened sap on the fruit, but no curculio infestation inside.
-Lon Rombough
Grapes, writing, consulting, my book, The Grape Grower, at http://www.bunchgrapes.com  Winner of the Garden Writers Association "Best Talent in Writing" award for 2003. 
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On Nov 14, 2007, at 4:18 AM, Alan Haigh wrote:

 
One more thing, in my region Japanese plums are much more PC resistant than the Europeans.  I often get useful plums from unsprayed Japanese varieties in my nursery where the only insecticide I use is for borers on the trunks of peaches.  I'm guessing that the Japanese varieties are growing so rapidly when PC arrives they crush the worms.  Does anyone out there have a more researched opinion?