02017naa a2200265 a 450000100080000000500110000800800410001910000140006024501230007426000090019750001620020652010650036865000230143365000200145665000220147665000240149865300210152265300230154370000180156670000180158470000170160270000180161970000250163777300890166211012612019-02-25       2000    bl uuuu     u00u1 u    #d1 aGHINI, R.  aFusarium oxysporum strains as biocontrol agents against fusarium wiltbeffects on soil microbial biomass and activity.  c2000  aTítulo em português: Linhagens de Fusarium oxysporum como agentes de biocontrole da murcha-de-fusarium: efeitos na biomassa e atividade microbiana do solo.  aBefore planning the large-scale use of nonpathogenic strains of Fusarium oxysporum as biocontrol agents of Fusarium wilt, their behaviour and potential impact on soil ecosystems should be carefully studied as part of risk assessment. The aim of this work was to evaluate the effects of antagonistic F. oxysporum strains, genetically manipulated (T26/6) or not (233/1), on soil microbial biomass and activity. The effects were evaluated, in North-western Italy, in two soils from different sites at Albenga, one natural and the other previously solarized, and in a third soil obtained from a 10-year-old poplar stand (Popolus sp.), near Carignano. There were no detectable effects on ATP, fluorescein diacetate hydrolysis, and biomass P that could be attributed to the introduction of the antagonists. A transient increase of carbon dioxide evolution and biomass C was observed in response to the added inoculum. Although the results showed only some transient alterations, further studies are required to evaluate effects on specific microorganism populations.  abiological control  arisk assessment  aAnálise de Risco  aControle Biológico  aPatogeno de solo  aSoilborne pathogen1 aMEZZALAMA, M.1 aAMBROSOLI, R.1 aBARBERIS, E.1 aGARIBALDI, A.1 aPIEDADE, S. M. de S.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 35, n. 1, p. 93-101, jan. 2000.