Título:	Progress of soybean charcoal rot under tillage and no-tillage systems in Brazil.
Autoria:	ALMEIDA, A. M. R. AMORIM, L. BERGAMIN FILHO, A. TORRES, E. FARIAS, J. R. B. BENATO, L. C. PINTO, M. C. VALENTIM, N.
Afiliação:	ALVARO MANUEL RODRIGUES ALMEIDA, CNPSO; LILIAN AMORIM, ESCOLA SUPERIOR DE AGRICULTURA LUIZ DE QUEIROZ; ARMANDO BERGAMIN FILHO, ESCOLA SUPERIOR DE AGRICULTURA LUIZ DE QUEIROZ; ELENO TORRES, CNPSO; JOSE RENATO BOUCAS FARIAS, CNPSO; LUÍS C. BENATO; MAURO C. PINTO; NILSON VALENTIM.
Ano de publicação:	2003
Referência:	Fitopatologia Brasileira, v. 28, n. 2, p. 131-135, mar./abr. 2003.
Conteúdo:	The increase in incidence of charcoal rot caused by Macrophomina phaseolina on soybeans (Glycine max) was followed four seasons in conventional and no-till cropping systems. In the 1997/98 and 2000/01 seasons, total precipitation between sowing and harvest reached 876.3 and 846.9 mm, respectively. For these seasons, disease incidence did not differ significantly between the no-till and conventional systems. In 1998/99 and 1999/00 precipitation totaled 689.9 and 478.3 mm, respectively. In 1998/99, in the no-till system, the disease incidence was 43.7% and 53.1% in the conventional system. In 1999/00 the final incidence was 68.7% and 81.2% for the no-till and conventional systems, respectively. For these two seasons, precipitation was lower than that required for soybean crops (840 mm), and the averages of disease incidence were significantly higher in the conventional system. The concentration of microsclerotia in soil samples was higher in samples collected in conventional system at 0 - 10 cm depth. However, analysis of microsclerotia in roots showed that in years with adequate rain no difference was detected. In dry years, however, roots from plants developed under the conventional system had significantly more microsclerotia. Because of the wide host range of M. phaseolina and the long survival times of the microsclerotia, crop rotation would probably have little benefit in reducing charcoal rot. Under these study conditions it may be a better alternative to suppress charcoal rot by using the no-till cropping system to conserve soil moisture and reduce disease progress.
Thesagro:	Podridão da Raiz Soja Semeadura
NAL Thesaurus:	Soybeans Root rot
Digital Object Identifier:	10.1590/S0100-41582003000200002
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPSO)