Stewart Robert Hinsley schreef
The web has over 500 pages which contain the terms "Prunus" and "self-
incompatibility"; a significant proportion are on self-incompatibility
in Prunus. URL:http://www.google.com/search?num=100&hl=en&lr=&ie=ISO-
8859-1&as_qdr=all&q=Prunus+self-incompatibility. Hopefully one of these
pages will explain how it works in Prunus.

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"self-incompatibility" and "cherries" yields this cheerful-looking site:
http://www.nysaes.cornell.edu/hort/f...on_Information
/Pollination%20information.html

PvR