00542nam a2200157Ia 4500001001000000003000500010008004100015010001100056040000900067100003100076245011400107260005000221300001000271502004700281650005600328Para_3050CHAP220125s1967    xx            000 0 und d  a201552  cCHAP  aRomero Cova, Sebastíán  aEffects of genetic recombination on the pathogenicity of Phythophthora infestans  /c Sebastián Romero Cova  aRiverside, Cal.  :b University of California  a68 p.  aTesis (Ph. D.) -- University of California  aTizón tardío de la papa  Phytophthora infestans