The "official" ARS site for Casimoroa's is the Subtropical Horticulture Research Station in Miami (
http://www.ars.usda.gov/Main/docs.htm?docid=10134 ). Not much info there, unless you are lucky enough to meet one of the staffers.
The University of South Florida has a good outreach program on tropical and subtropical fruits, for example:
http://edis.ifas.ufl.edu/HE632 I've learned a lot from this site in general.
The CRFG web pages have an interesting article in the fruit facts, but these pages are sorely in need of updates:
http://www.crfg.org/pubs/ff/whitesapote.html Worth reading for the timeless information.
I noticed a small plot of mature trees at the UC ANR South Coast Field Station in Irvine last September (2007), but I keep procrastinating about determining the PI, etc.
