INTERACTIONS BETWEEN Fusarium solani f. sp. phaseoli AND Rhizoctonia solani ON THE SEVERITY OF DRY BEAN ROOT ROT

Authors

  • Eliane Divina de Tolêdo-Souza UFG
  • Murillo Lobo Júnior EMBRAPA
  • Pedro Marques da Silveira EMBRAPA
  • Adalberto Corrêa Café Filho UNB

Keywords:

Soilborne fungus, bean diseases, soil infestation.

Abstract

The present work aimed to evaluate the effect of inoculum densities of Fusarium solani f. sp. phaseoli (Fsp) and Rhizoctonia solani (Rs) and their interactions on the severity of root rot and on the dry mass of bean plants. Soil was infested by the addition of Rs or Fsp-colonized sorghum seeds, in the amounts of 0.00 g; 0.06 g; 0.12 g; 0.25 g; 0.50 g; and 1.00 g for Rs, and 0 g; 1g; 2 g; 4 g; 8 g; and 16 g for Fsp per pot (1.4 kg of soil). The densities used for the joint soil infestations with both pathogens were the same used in the separate pathogen infestations. A progressive rise in the severity of root rots was observed with the increase of inoculum density for both pathogens. Maximum disease severities for Rs were 67% and 22%, in separate or combined infections with Fsp, respectively. Maximum disease severities with Fusarium were 14% and 38%, in separate or combined infections with Rs, respectively. The results suggest that Rhizoctonia solani stimulated the expression of symptoms of Fusarium solani f. sp. phaseoli, while Fsp inhibited the expression of symptoms caused by Rs. Negative correlations between the inoculum density and bean dry weight were generally observed, except for the single infestation with Fsp.


KEY-WORDS: Soilborne fungus; bean diseases; soil infestation.

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Author Biographies

Eliane Divina de Tolêdo-Souza, UFG

Universidade Federal de Goiás, Rod. Goiânia/Nova Veneza Km 0, Caixa Postal 131, Campus Samambaia, Departamento Fitossanitário, CEP 74001-970, Goiânia, GO. E-mail: eliane.d.toledo@gmail.com

Murillo Lobo Júnior, EMBRAPA

Embrapa Arroz e Feijão, Rod. GO 462, Km 12, Zona Rural, Caixa Postal 179 CEP 75375-000, Santo Antonio de Goiás, Goiás. E-mail: murillo@cnpaf.embrapa.br,

Pedro Marques da Silveira, EMBRAPA

Embrapa Arroz e Feijão, Rod. GO 462, Km 12, Zona Rural, Caixa Postal 179 CEP 75375-000, Santo Antonio de Goiás, Goiás.

Adalberto Corrêa Café Filho, UNB

Universidade de Brasília, Instituto de Ciências Biológicas, Departamento de Fitopatologia, Caixa Postal 4457, CEP 70910-500, Brasilia, DF. E-mail: cafefilh@unb.br

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Published

2009-02-19

How to Cite

TOLÊDO-SOUZA, E. D. de; LOBO JÚNIOR, M.; SILVEIRA, P. M. da; CAFÉ FILHO, A. C. INTERACTIONS BETWEEN Fusarium solani f. sp. phaseoli AND Rhizoctonia solani ON THE SEVERITY OF DRY BEAN ROOT ROT. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, v. 39, n. 1, p. 13–17, 2009. Disponível em: https://revistas.ufg.br/pat/article/view/3507. Acesso em: 22 dec. 2024.

Issue

v. 39, n. 1, Jan./Mar. 2009

Section

Research Article

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