** Shares of Woolworths WOW.AX fall as much as 12.7% to A$29.17, their lowest level since March 27
** Woolworths, the country's top supermarket chain, posted weak 2.1% growth in sales at Australian Food segment in start of fiscal 2026, missing Visible Alpha consensus forecast of 4.1% for first six months
** Sales growth lagged a nearly 5% growth in smaller peer Coles COL.AX reported on Tuesday in its supermarkets division for first eight weeks of current fiscal
** WOW reported FY underlying profit down 19% to A$1.39 billion ($903.22 million)
** Stock marks worst intraday pct drop in nearly three decades
** Stock down ~4% this year, including the day's move, vs a 4.4% decline in the consumer staples sub-index .AXSJ
($1 = 1.5389 Australian dollars)
(Reporting by Shivangi Lahiri in Bengaluru)
((shivangi.lahiri@thomsonreuters.com))