00408naa a2200133 a 450000100080000000500110000800800410001910000180006024500670007826000090014565300240015465300250017877300710020318257972010-01-10       1970    bl ---       0--  u    #d1 aWATSON, I. A.  aChanges in virulence and population shifts in plant pathogens.  c1970  aParasita hospedeiro  aSeleção Organismos  tAnnual Review of Phytopathology, Palo Altogv. 8, p 209-230, 1970.