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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
13/05/1993 |
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Data da última atualização: |
27/10/2004 |
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Autoria: |
SCHMITTHENNER, A. F. |
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Afiliação: |
The Ohio State University, Wooster, Ohio 44691, U.S.A. |
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Título: |
Phytophthora root rot: detection, ecology and control. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
In: CONFERENCIA MUNDIAL DE INVESTIGACION EN SOJA, 4., 1989, Buenos Aires. Actas... Buenos Aires: AASOJA, 1989. |
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Volume: |
t.3 |
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Páginas: |
p.1284-1289. |
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Idioma: |
Inglês |
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Conteúdo: |
Phytophthora root rot of soybean caused by P. megasperma f. sp. glycinea (Pmg) was first found in the United States, where it can kill 100% of susceptible plants. Average loss is estimated at 5%. Although widely distributed, it has not yet been reported from Central and South America or Asia. Symtoms are seed rot, damping-off, root rot, stem rot, wilting and reduced vigor and stem lesions on older plants. Severity is dependent on cultivar tolerance (relative susceptibility). The pathogen survives for many years as oopsores in debris from diseased plants. Primary infection occurs from zoospores formed from oospores in soil. Flooded soil is required for severe infection, and highly tolerant cultivars may escape if no flooding occurs. Early infection periods are more damaging than late ones. Factors increasing severity are flooding rainfall, poorly drained soil, reduced tillage, high soil salts, and continous cropping of soybean. Phytophthora can be controlled by monogenic, race-specific resistance; 12 genes at six loci have been described. Twenty-five Pmg races have been reported , some of which are virulent to the latest resistance gene combination released. Alternative controls are application of metalaxyl to soil, which is most effective with the high tolerance, improved drainage, plowing or other tillage, metalaxyl seed treatment, and rotation. |
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Palavras-Chave: |
Disease; EUA; Fitopatologia; Fungus; Phytopathology; Soybean; USA. |
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Thesagro: |
Doença; Fungo; Phytophthora Megasperma; Soja. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02095naa a2200277 a 4500
001 1454653
005 2004-10-27
008 1989 bl uuuu u00u1 u #d
100 1 $aSCHMITTHENNER, A. F.
245 $aPhytophthora root rot$bdetection, ecology and control.
260 $c1989
300 $ap.1284-1289. t.3
490 $vt.3
520 $aPhytophthora root rot of soybean caused by P. megasperma f. sp. glycinea (Pmg) was first found in the United States, where it can kill 100% of susceptible plants. Average loss is estimated at 5%. Although widely distributed, it has not yet been reported from Central and South America or Asia. Symtoms are seed rot, damping-off, root rot, stem rot, wilting and reduced vigor and stem lesions on older plants. Severity is dependent on cultivar tolerance (relative susceptibility). The pathogen survives for many years as oopsores in debris from diseased plants. Primary infection occurs from zoospores formed from oospores in soil. Flooded soil is required for severe infection, and highly tolerant cultivars may escape if no flooding occurs. Early infection periods are more damaging than late ones. Factors increasing severity are flooding rainfall, poorly drained soil, reduced tillage, high soil salts, and continous cropping of soybean. Phytophthora can be controlled by monogenic, race-specific resistance; 12 genes at six loci have been described. Twenty-five Pmg races have been reported , some of which are virulent to the latest resistance gene combination released. Alternative controls are application of metalaxyl to soil, which is most effective with the high tolerance, improved drainage, plowing or other tillage, metalaxyl seed treatment, and rotation.
650 $aDoença
650 $aFungo
650 $aPhytophthora Megasperma
650 $aSoja
653 $aDisease
653 $aEUA
653 $aFitopatologia
653 $aFungus
653 $aPhytopathology
653 $aSoybean
653 $aUSA
773 $tIn: CONFERENCIA MUNDIAL DE INVESTIGACION EN SOJA, 4., 1989, Buenos Aires. Actas... Buenos Aires: AASOJA, 1989.
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Registro original: |
Embrapa Soja (CNPSO) |
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