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Registro Completo |
Biblioteca(s): |
Embrapa Meio-Norte. |
Data corrente: |
01/04/1998 |
Data da última atualização: |
01/04/1998 |
Autoria: |
LARKIN, R. P.; HOPKINS, D. L.; MARTIN, F. N. |
Título: |
Suppression of fusarium wilt of watermelon by nonpathogenic Fusarium oxysporum and other microorganisms recovered from a disease - suppressive soil. |
Ano de publicação: |
1996 |
Fonte/Imprenta: |
Phytopathology, v. 86, n. 8, p. 812-819, 1996. |
Idioma: |
Inglês |
Conteúdo: |
Nearly 400 microorganism isolates, including bacteria, actinomycetes, and fungi, were collected from watermelon roots growing in soils suppressive and nonsuppressive to Fusarium wilt of watermelon. These isolates were screened for their ability to restore suppressiveness to microwave-treated suppressive soil and to reduce disease incidence in conducive field soil. Specific isolates of nonpathogenic Fusarium oxysporum from suppressive soil were the only organisms consistently effective in reducing disease (35 to 75% reduction) in both microwave-treated and natural field soils. Thus, we concluded that F. oxysporum was the primary antagonist responsible for suppression in this suppressive soil, although other organisms may contribute to suppressiveness. Selected isolates of F. oxysporum were effective in reducing disease when added to field soils at inoculum levels as low as 50 to 100 chlamydospores per g of soil, which was comparable to or below pathogen inoculum levels (100 to 200 CFU/g of soil). Root colonization data indicated that reduction of disease was not directly related to the ability of the antagonist to colonize roots extensively or to reduce colonization by the pathogen. Effective antagonists were not associated with specific vegetative commpatibility groups, indicating antagonists represent diverse isolates. In split-root experiments, in which the antagonist and the pathogen were physically separated from each other, root colonization by selected isolates of F. oxysporum reduced disease incidence, verifying the mechanism of action as induced systemic resistance. Several isolates of F. oxysporum from this suppressive soil have potential for development as biocontrol agents. MenosNearly 400 microorganism isolates, including bacteria, actinomycetes, and fungi, were collected from watermelon roots growing in soils suppressive and nonsuppressive to Fusarium wilt of watermelon. These isolates were screened for their ability to restore suppressiveness to microwave-treated suppressive soil and to reduce disease incidence in conducive field soil. Specific isolates of nonpathogenic Fusarium oxysporum from suppressive soil were the only organisms consistently effective in reducing disease (35 to 75% reduction) in both microwave-treated and natural field soils. Thus, we concluded that F. oxysporum was the primary antagonist responsible for suppression in this suppressive soil, although other organisms may contribute to suppressiveness. Selected isolates of F. oxysporum were effective in reducing disease when added to field soils at inoculum levels as low as 50 to 100 chlamydospores per g of soil, which was comparable to or below pathogen inoculum levels (100 to 200 CFU/g of soil). Root colonization data indicated that reduction of disease was not directly related to the ability of the antagonist to colonize roots extensively or to reduce colonization by the pathogen. Effective antagonists were not associated with specific vegetative commpatibility groups, indicating antagonists represent diverse isolates. In split-root experiments, in which the antagonist and the pathogen were physically separated from each other, root colonization by selected isolates of F. ... Mostrar Tudo |
Palavras-Chave: |
Citrullus llanatus; Rhizooplane; Soil microbiology. |
Thesagro: |
Controle Biológico; Doença Fúngica; Fusarium Oxysporum; Melancia. |
Thesaurus Nal: |
rhizosphere. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02447naa a2200241 a 4500 001 1052311 005 1998-04-01 008 1996 bl --- 0-- u #d 100 1 $aLARKIN, R. P. 245 $aSuppression of fusarium wilt of watermelon by nonpathogenic Fusarium oxysporum and other microorganisms recovered from a disease - suppressive soil. 260 $c1996 520 $aNearly 400 microorganism isolates, including bacteria, actinomycetes, and fungi, were collected from watermelon roots growing in soils suppressive and nonsuppressive to Fusarium wilt of watermelon. These isolates were screened for their ability to restore suppressiveness to microwave-treated suppressive soil and to reduce disease incidence in conducive field soil. Specific isolates of nonpathogenic Fusarium oxysporum from suppressive soil were the only organisms consistently effective in reducing disease (35 to 75% reduction) in both microwave-treated and natural field soils. Thus, we concluded that F. oxysporum was the primary antagonist responsible for suppression in this suppressive soil, although other organisms may contribute to suppressiveness. Selected isolates of F. oxysporum were effective in reducing disease when added to field soils at inoculum levels as low as 50 to 100 chlamydospores per g of soil, which was comparable to or below pathogen inoculum levels (100 to 200 CFU/g of soil). Root colonization data indicated that reduction of disease was not directly related to the ability of the antagonist to colonize roots extensively or to reduce colonization by the pathogen. Effective antagonists were not associated with specific vegetative commpatibility groups, indicating antagonists represent diverse isolates. In split-root experiments, in which the antagonist and the pathogen were physically separated from each other, root colonization by selected isolates of F. oxysporum reduced disease incidence, verifying the mechanism of action as induced systemic resistance. Several isolates of F. oxysporum from this suppressive soil have potential for development as biocontrol agents. 650 $arhizosphere 650 $aControle Biológico 650 $aDoença Fúngica 650 $aFusarium Oxysporum 650 $aMelancia 653 $aCitrullus llanatus 653 $aRhizooplane 653 $aSoil microbiology 700 1 $aHOPKINS, D. L. 700 1 $aMARTIN, F. N. 773 $tPhytopathology$gv. 86, n. 8, p. 812-819, 1996.
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Registro Completo
Biblioteca(s): |
Embrapa Arroz e Feijão. |
Data corrente: |
24/07/2023 |
Data da última atualização: |
01/08/2023 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
C - 0 |
Autoria: |
MIRANDA, J. E.; TRIPODE, B. M. D.; JARDIM, V. de L.; SILVA, C. S. B. da; QUINTELA, E. D. |
Afiliação: |
JOSE EDNILSON MIRANDA, CNPA; BRUNA MENDES DINIZ TRIPODE, CNPA; VALERIA DE LIMA JARDIM; CHERRE SADE BEZERRA DA SILVA, CNPA; ELIANE DIAS QUINTELA, CNPAF. |
Título: |
Algodão: inimigos do pulgão. |
Ano de publicação: |
2023 |
Fonte/Imprenta: |
Cultivar Grandes Culturas, v. 33, n. 289, p. 36-39, 2023. |
ISSN: |
1516-358X |
Idioma: |
Português |
Conteúdo: |
Controle do pulgão-do-algodoeiro pode ser realizado por meio de outros insetos ou de fungos entomopatogênicos. Pulgão como bioindicador. Controle biológico natural e aplicado. Parasitoides e predadores. Fungos entomopatogênicos. |
Thesagro: |
Algodão; Aphis Gossypii; Controle Biológico; Fungo Entomógeno; Inseto Para Controle Biológico; Praga de Planta; Pulgão. |
Thesaurus NAL: |
Biological control; Biological control agents; Cotton; Parasitoids; Plant pests. |
Categoria do assunto: |
O Insetos e Entomologia |
Marc: |
LEADER 01114naa a2200325 a 4500 001 2155217 005 2023-08-01 008 2023 bl uuuu u00u1 u #d 022 $a1516-358X 100 1 $aMIRANDA, J. E. 245 $aAlgodão$binimigos do pulgão.$h[electronic resource] 260 $c2023 520 $aControle do pulgão-do-algodoeiro pode ser realizado por meio de outros insetos ou de fungos entomopatogênicos. Pulgão como bioindicador. Controle biológico natural e aplicado. Parasitoides e predadores. Fungos entomopatogênicos. 650 $aBiological control 650 $aBiological control agents 650 $aCotton 650 $aParasitoids 650 $aPlant pests 650 $aAlgodão 650 $aAphis Gossypii 650 $aControle Biológico 650 $aFungo Entomógeno 650 $aInseto Para Controle Biológico 650 $aPraga de Planta 650 $aPulgão 700 1 $aTRIPODE, B. M. D. 700 1 $aJARDIM, V. de L. 700 1 $aSILVA, C. S. B. da 700 1 $aQUINTELA, E. D. 773 $tCultivar Grandes Culturas$gv. 33, n. 289, p. 36-39, 2023.
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