How are the Zill's stuff getting into the US? Why aren't the large litchi's not available in the US? How would they get here? I see that some nurseries in Oz have cultivars that originate in florida? How did they get there?
Not Zill since He is In USA , but
Remember mango can be
Monoembryonic (producing one plant, that is not a clone or
polyembryonic, and will come true to type producing 2 plants
That is sad about the citrus cuttings (I quote)
because maybe that citrus could of just been grown as a seed, and be a clone of the mother plant.
Most common citrus such as oranges, grapefruit, lemons and most mandarins are polyembryonic and will come true to type.
Pholloxera almost wiped out the European grapes when in the 1800's the parasite started killing all the vines in Europe After someone brought American grapes over
T.V Muson saved the wine of Europe by grafting to American root stock since it is resistant
because the disease came from the USA grapes, and the adapted immunity .
Also some diseases are harbored on other species
(like our native TEA Franklina alatamaha or the lost camomila )
is harbored on cotton to cause a disease on it.
I would always be interested in going to some place , and getting permits to bring back stuff
I think you also have to trail it by the USDA one green world does it a lot (forgot his name)
one plant (in the apple family) he had to destroy as it was becoming invasive.