02404naa a2200481 a 450000100080000000500110000800800410001910000250006024500890008526000090017452011610018365000110134465000140135565000140136965000150138365000090139865000130140765000100142065000220143065000120145265000160146465000280148065000200150865000170152865000170154565000230156265000230158565000120160865300130162065300110163365300230164465300130166765300220168065300150170265300110171765300200172865300170174865300150176565300260178065300110180670000210181777300840183817651041999-08-09       1989    bl uuuu     u00u1 u    #d1 aSANTOS, J. R. M. dos  aAvaliacao de doencas em germoplasma de arroz em varzea e em terra firme no Amazonas.  c1989  aResumo - Foram estudadas as principais doenças de arroz que ocorrem em Manaus. Foi constatada a incidência de Helminthosporium oryzae, Pyriculatia oryzae, Rhinchosporium oryzae, Cercospora oryzae e Rhizoctonia solani atacando arroz em ambos os ecossistemas. Na terra firme, a principal doença observada foi a mancha-do-grão e a mancha-parda, causadas por H. oryzae. Na várzea, a queima da bainha e do colmo teve incidência acima de 25%, porém tardia, não afetando o peso de panículas nem o índice de mancha ou chochamento do grão.  Abstract - The main rica diseases that occurre in Manaus, AM, Brazi!, were evaluated by two experimenis. On of them was placed on the upland, and lhe other one on lhe periodically flooded lowland. This paper also reports tho occurrence ot Pyricularia oryzae, Helminthosporitim oryzae, Rhynchosporium oryzae, Ceitospora oryzae and Rhizoctonia solani atlacking rice in the Amazonas state. Grain spot and leal spot caused by H. oryzae were the principal problems on lhe upland. On lhe lowland, the incidence ol A. se/aoi was high, more ifian 250Jo, but, the atlack was late and the grain production was not aflected.  aBrazil  agermplasm  aleaf spot  aoccurrence  aRice  awetlands  aArroz  aCercospora Oryzae  aDoença  aGermoplasma  aHelminthosporium Oryzae  aMancha do Grão  aMancha Parda  aOryza Sativa  aPyricularia Oryzae  aRhizoctonia Solani  aVárzea  aAmazonas  aBrasil  aCercosporae oryzae  aDiseases  adoenças do arroz  aGrain spot  aManaus  amancha-do-grão  amancha-parda  aOcorrencia  aRhinchosporium oryzae  aSurvey1 aGALVAO, E. U. P.  tPesquisa Agropecuaria Brasileira, Brasiliagv.24, n.12, p.1483-1488, dez. 1989.