01840naa a2200313 a 450000100080000000500110000800800410001910000190006024501230007926000090020230000200021149000080023152009640023965000110120365000120121465000100122665000130123665000250124965000170127465300110129165300120130265300180131465300110133265300190134365300150136265300140137770000230139177301120141414530322004-10-28       1985    bl uuuu     u00u1 u    #d1 aHENNING, A. A.  aPhysiological race and sources of resistance to downy mildew (Plasmopara halstedii (Farl.) Berl. & de Toni) in Brazil.  c1985  ap.407-409.  t.2  vt.2  aThe occurrence of the sunflower downy mildew in Brazil was observed in 1982. This study was carried out to determine the physiological race and to find out possible sources of resistance to P. halstedii. Identification of the race was made using the breeding lines AD 66, (resistant to European race I), RHA 271 and RHA 274, resistant to European race I and American race II, and cultivar Issanka, susceptible to both races Seeds were artificially inoculated with oospore suspension obtained from field infected leaves, and planted in the greenhouse in trays containing nonsterilized soil. The disease was observed only on plants of Issanka and AD 66, indicating that the race of P. halstedii occurring in Brazil is the American race II. Among the several lines, varieties and hybrids tested, Issanka, Cordobes, Contissol 112, Progress, PGIB, PIIDR, KLM, 3GR, 2GB x Nains and 6B x Ilnissei were susceptible. Only the hybrid DK 180 wasresistant to the disease.  aBrazil  aDoença  aFungo  aGirassol  aPlasmopara Halstedii  aResistência  aBrasil  aDisease  aFitopatologia  aFungus  aPhytopathology  aResistance  aSunflower1 aFRANCA NETO, J. B.  tIn: CONFERENCIA INTERNACIONAL DE GIRASOL, 11., 1985, Mar del Plata, Actas. Mar del Plata: ASAGIR/ISA, 1985.