Has anyone done breeding or selection on Lemon Guava? Anyone know of any trees that produce particularly large / sweet fruit in large quantities? The trees seem pretty variable in general, and while quite hardy the fruit is sometimes nice and sometimes bland, sometimes large and sometimes small, etc. I did once plant out a bunch of seeds from a large-fruited tree, but never followed up to see if this quality was retained in the offspring. If breeding is viable in it in the short term, it seems like a worthwhile plant to breed.
Separately, it might be worth doing a fruit expedition through the thickets of Strawberry Guava in Hawaii to find good cultivars, but I'm guessing most of the fruit is ruined by fruit flies.