Historical clue formulations

• Jan ___, South African leader instrumental in establishing the League of Nations — 2012-10-06
• Onetime South African P.M. Jan — 2010-03-17
• Plant diseases — 2007-05-31
• Plant fungi — 2003-12-12
• 1940's South African P.M. — 1997-11-07
• Early South African P.M. Jan — 1996-03-03
• South African statesman Jan — 1994-05-03