** Shares of Australian tech companies .AXIJ fall as much as 2.9%, hitting their lowest level since February 25
** Sub-index tracks a decline in Wall Street peers — down after the U.S. Federal Reserve held interest rates steady .N
** Sub-index logs worst trading day since March 12
** Sector giants WiseTech Global WTC.AX falls 4.4%, while Xero XRO.AX sheds 3.1%
** AXIJ down nearly 25% so far this year, including day's move
(Reporting by Rajasik Mukherjee in Bengaluru)
((Rajasik.Mukherjee@thomsonreuters.com))