Unfortunately for those farmers like Serrato - but much to the delight of Hispancic consumers - the USDA seems poised to open the door to Mexican tejocote.
More about the tejocote, from the USDA's PRA:
The fruit appears similar to a small apple, yellow to orange in color, and from one to two centimeters in diameter. The trees are evergreen, flowering from January to April. The fruits are formed in spring and mature until November or December, when they are harvested. In Mexico, the fruit is commercially produced mainly in the states of Puebla, Oaxaca, and Chiapas. Fruit is harvested by hand and packed in insect-proof boxes for export. SAGARPA estimates that 200 tons would be exported to the U.S.