8 ▁using ▁DNA ▁typing ▁showed ▁a ▁close ▁gen etic ▁relationship ▁between ▁G arg an ega ▁on ▁the ▁one ▁hand ▁and ▁Tre bb iano ▁and ▁several ▁other ▁gra pe ▁vari eties ▁on ▁the ▁other ▁hand . ▁It ▁is ▁therefore ▁possible ▁that ▁G arg an ega ▁is ▁one ▁of ▁the ▁parents ▁of ▁Tre bb iano ; ▁however , ▁since ▁the ▁parents ▁of ▁G arg an ega ▁have ▁not ▁been ▁identified , ▁the ▁exact ▁nature ▁of ▁the ▁relationship ▁could ▁not ▁be ▁conclus ively ▁established . ▁ ▁Rel ations hip ▁to ▁other ▁g rap es ▁During ▁a ▁series ▁of ▁tri als ▁between ▁ 1 9 2 4 ▁and ▁ 1 9 3 0 , ▁Tre bb iano ▁was ▁crossed ▁with ▁Gew ür z tr am iner ▁to ▁create ▁the ▁p ink - sk inned ▁Italian ▁wine ▁gra pe ▁variety ▁Man z oni ▁ro sa . ▁Also , ▁in ▁the ▁early ▁ 2 1 st ▁century , ▁DNA ▁analysis ▁has ▁suggested ▁that ▁there ▁may ▁be ▁a ▁close ▁gen etic ▁relationship ▁between ▁Tre bb iano ▁and ▁the ▁Em ilia - R om agna ▁wine ▁gra pe ▁Al ion za . ▁ ▁Distribution ▁and ▁w ines ▁ ▁Argentina ▁Like ▁many ▁Italian ▁g rap es , ▁Tre bb iano ▁came ▁to ▁Argentina ▁with ▁Italian ▁imm igr ants . ▁ ▁Australia ▁" White ▁Herm itage " ▁came ▁to ▁Australia ▁with ▁James ▁Bus by ▁in ▁ 1 8 3 2 . ▁The ▁major ▁plant ings ▁are ▁in ▁New ▁South ▁Wales ▁and ▁South ▁Australia , ▁where ▁it ▁is ▁mostly ▁used ▁for ▁br andy ▁and