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Leaf  leachates  of  two  cultivars  of potato  i.e.  Kufri  Chandramukhi   (KCM)  and  Kufri  Jyoti  (KJ  ) contain  nine amino  acids.  Total  sugar content  of   KCM  and KJ leachates  varied between  0.10 and  0.37 µg  per sq.  cm and  0.02 to  0.23  µg  per sq.  cm.  respectively.   The  sugars  exuded  more  by KCM.  Total  phenol  content  of  KCM  and  KJ leachates  varied  between  1.00  to 2.0 µg per sq.  cm  and 1.05  to  3.16   µg per  sq.  cm  respectively.  The  percentage germination  of  P. infestans  sporangia  in KCM  and KJ  cultivars  was  more  in  mature  leaf  leachates  as  compared to  young  leaves,  moreover  it was less  in KJ  cultivar  as  compared  to  KCM.  The  germ  tube  length  of  P.  infestans zoospores  in  leaf  leachates  was inhibited  in both  the  cultivars  except  in  mature  leaf  leachate  of  94  days  old Ku fri  Chandramukhi.