The 31-year-old crossed to seal the bonus point for his side on a day which saw the Warriors blitz Zebre 42-10 in Parma.
After Matt Fagerson’s powerful drive put the Scottish team up, captain Chris Fusaro and Stafford McDowall ran in the second and third tries for the visitors.
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Cue the arrival of veteran Jackson, who’s had Warriors’ fans out of their seats ever since he rejoined the club in 2017.
Adam Hastings’ excellent vision and deft chip bounced fortunately into Jackson’s arms, and his attacking awareness saw him in the right place to finish with aplomb to score his maiden try of the season.
The fan favourite was clearly delighted as he contributed to a mammoth victory which took Glasgow top of Conference A following Munster’s loss at Scarlets.
The second half may have seen Zebre stem the tide of Scottish attacks, but Jackson’s try – Warriors’ fourth of the day and one that ensured the full five points went to the Scots – could prove crucial in the race for first place.