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The UCR collection has 3 accession types of Uglihttps://citrusvariety.ucr.edu/citrus/ugli_2780.htmlhttps://citrusvariety.ucr.edu/citrus/ugli_4171.htmlhttps://citrusvariety.ucr.edu/citrus/CRC4127.htmlYour fruit doesn't look exactly like any of these.The Ugli wasn't officially introduced to Australia, as far as i know, so may have come in as seed.If it's an Ugli you may have a seed variant ??Also looks a bit like Sanbokanhttps://citrusvariety.ucr.edu/citrus/sanbokan.html
Millet,GN fruits are usually ready between March to May/Jun. Unfortunately, it is the same period of blooming.Will the fruits remaining on the tree retard the blooming so cause alternative bearing? The fruits can be picked up earlier but they would not taste sweet (I tried. They were bland in March and improved gradually to May/June).