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Germoplasmas de mandioca para tolerancia ao estiolamento causado por Botryodiplodia theobromae Pat

By: Contributor(s): Material type: Continuing resourceContinuing resourceLanguage: Portuguese Series: Comunicado técnico no. 208Publication details: Campos, BR Empresa de Pesquisa Agropecuária do Estado do Rio de Janeiro (PESAGRO) 1991Description: 5 pSubject(s): LOC classification:
  • 41193
Summary: En la estacion exptl. de Campos, Brasil, se evaluo y selecciono germoplasma de yuca tolerante a etiolacion (clorosis) causada por Botryodiplodia theobromae. La frecuencia de clorosis se evaluo con base en las plantas sobrevivientes con o sin sintomas, en relacion con un no. de plantas esperado/parcela, segun una escala progresiva de dano x susceptibilidad. Germoplasma identificado como promisorio fue Canela de Urubu I, Aipim Rosinha, IAC 5-51 y SRT 1099 por su resistencia/tolerancia a B. theobromae. Para reducir la clorosis en los cultivos de yuca y complementar la identificacion de cv. tolerantes, se recomienda realizar con cuidado la transferencia de material de propagacion en areas exentas de problemas, hacer una seleccion rigurosa de estacas sanas, aplicar un tratamiento quimico presiembra con fungicidas a base de mancozeb y desinfectar los instrumentos de corte de las estacas con alcohol etilico. (CIAT)Summary: Cassava germplasm tolerant to etiolation (chlorosis) caused by Botryodiplodia theobromae was assessed and selected at the Campos exptl. station, Brazil. Frequency of chlorosis was assessed on the basis of surviving plants with or without symptoms, in relation to the no. of expected plants/plot, according to a progressive damage x susceptibility scale. Most promising germplasm was Canela de Urubu I, Aipim Rosinha, IAC 5-51, and SRT 1099 due to their resistance/tolerance to B. theobromae. To reduce chlorosis in cassava crops and complement the identification of tolerant cv., recommendations are to carefully transfer propagation materials to disease-free areas, rigorously select healthy cuttings, apply preplanting chemical treatment with mancozeb-based fungicides, and disinfect cutting instruments with ethyl alcohol. (CIAT)
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En la estacion exptl. de Campos, Brasil, se evaluo y selecciono germoplasma de yuca tolerante a etiolacion (clorosis) causada por Botryodiplodia theobromae. La frecuencia de clorosis se evaluo con base en las plantas sobrevivientes con o sin sintomas, en relacion con un no. de plantas esperado/parcela, segun una escala progresiva de dano x susceptibilidad. Germoplasma identificado como promisorio fue Canela de Urubu I, Aipim Rosinha, IAC 5-51 y SRT 1099 por su resistencia/tolerancia a B. theobromae. Para reducir la clorosis en los cultivos de yuca y complementar la identificacion de cv. tolerantes, se recomienda realizar con cuidado la transferencia de material de propagacion en areas exentas de problemas, hacer una seleccion rigurosa de estacas sanas, aplicar un tratamiento quimico presiembra con fungicidas a base de mancozeb y desinfectar los instrumentos de corte de las estacas con alcohol etilico. (CIAT) spa

Cassava germplasm tolerant to etiolation (chlorosis) caused by Botryodiplodia theobromae was assessed and selected at the Campos exptl. station, Brazil. Frequency of chlorosis was assessed on the basis of surviving plants with or without symptoms, in relation to the no. of expected plants/plot, according to a progressive damage x susceptibility scale. Most promising germplasm was Canela de Urubu I, Aipim Rosinha, IAC 5-51, and SRT 1099 due to their resistance/tolerance to B. theobromae. To reduce chlorosis in cassava crops and complement the identification of tolerant cv., recommendations are to carefully transfer propagation materials to disease-free areas, rigorously select healthy cuttings, apply preplanting chemical treatment with mancozeb-based fungicides, and disinfect cutting instruments with ethyl alcohol. (CIAT) eng

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