Agar guided Hull to the Challenge Cup final at Wembley in 2008 with an injury-ravaged squad.
BBC: Denis Betts plays down England Rugby League speculation
Coach Richard Agar described his performance in Friday night's 20-18 defeat by Castleford as 'disgraceful'.
Agar had returned to work this week for the first time since breaking his shoulder in January.
"It was literally two minutes before kick-off when we decided to pull him, " said coach Richard Agar.
"He's going to be off for an extended period, " Hull coach Richard Agar told BBC Radio Humberside.
The fluid with the bacteria in it was dotted on to agar plates.
His signing comes a day after the club appointed Richard Agar as head coach following the departure of Peter Sharp.
Hull coach Richard Agar admitted the issue was "a hot potato, " but said he backed the player's involvement with England.
The club have confirmed the 53-year-old Australian will leave with immediate effect and that assistant Richard Agar will take temporary charge.
But Richard Agar's side were blown away after the interval, Godwin going over from close range within two minutes of the restart.
Without a word, she pointed to Agar, who was walking toward us.
Spots showed up on the agar as individual bacteria grew and multiplied.
Agar will take charge of the team for Sunday's home match against St Helens and it is his second spell in temporary control.
Georgia Coles scored a brace on her debut and the rout was completed with goals from Lawler, Demi Agar, Amy Wild and Anusia Rourke.
Coach Richard Agar echoed Radford's sentiments, heaping praise on his team.
Agar stepped closer, throwing a crisp shadow over Yar's tiny body.
Toshiyuki Nakagaki of the Bio-Mimetic Control Research Centre, Nagoya, Japan, placed pieces of the slime mould Physarum polycephalum in an agar gel maze comprising four possible routes.
Agar and Agum and even Yar shared a giggle that offered ample evidence that the two of them had discussed me and my mental state at great length.
And Agar's extended commitment to Hull effectively leaves the Rugby Football League are looking for a full-time coach to take over in time for the 12 June international against France.
BBC: Denis Betts plays down England Rugby League speculation
Agar's current contract was due to run out at the end of the season but he will now stay in charge at the KC Stadium at least until the end of 2012.
BBC: Denis Betts plays down England Rugby League speculation
Richard Agar's Hull levelled on the half-hour mark, Yeaman running clear, and the Black and Whites moved into the lead shortly after half-time when Briscoe took advantage of some poor tackling to cross with ease.
Agar looks set to resist the temptation to throw Reardon straight into the side for the trip to St Helens on Easter Monday, despite naming the player in his 19-man squad for the game at Knowsley Road.
Hull coach Richard Agar's plans were in tatters as early as the sixth minute when, having resisted the temptation to recall regular full-back Jordan Tansey after suspension, by keeping faith with Craig Hall, he was cruelly rewarded.
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