Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/125885
Unidade da Embrapa/Coleção:: Área de Informação da Sede - Artigo em periódico indexado (ALICE)
Data do documento: 14-Jul-2009
Tipo do Material: Artigo em periódico indexado (ALICE)
Autoria: PINHEIRO, P.V.
QUINTELA, E.D.
OLIVEIRA, J.P. de
SERAPHIN, J.C.
Informaçães Adicionais: Embrapa Arroz e Feijão
Título: Toxicity of neem oil to Bemisia tabaci biotype B nymphs reared on dry bean.
Edição: 2009
Fonte/Imprenta: Pesquisa Agropecuária Brasileira, Brasília, v.44, n. 4, p. 354-360, abr. 2009.
Idioma: en
Palavras-chave: Azadirachta indica
Phaseolus vulgaris
immature stages
lethal concentration
whitefly
estágios imaturos
concentração letal
mosca-branca
Conteúdo: The objective of this work was to determine the most susceptible nymphal stage of Bemisia tabaci biotype B to neem (Azadirachta indica A. Juss.) oil applied to dry bean (Phaseolus vulgaris L.) in a screenhouse. A solution of commercial oil (Dalneem) extracted from neem seeds was sprayed directly on each nymphal instar at 0, 0.1, 0.25, 0.5, 1 and 2% concentrations for lethal concentration (LC) determination, and at 0, 0.5 and 1% concentrations for lethal time (LT) determination. The number of living and dead nymphs was recorded five days after spraying for LC determination, and daily during six days for LT determination. The LC50 estimated for fourth instar nymphs occurred at 0.56% concentration. For all instars, LC50 and LC95 were estimated at 0.32 and 2.78% concentrations, respectively. The estimated values of LT50 at 1% concentration were 2.46, 4.45, 3.02 and 6.98 days for the first to fourth instars, respectively. The LT50 occurred at five days for 0.5% and at four days for 1% concentration in all instars. A mortality rate of over 80% was observed on the 6th day for the first to third instars at 1% concentration. The first three nymphal stages were more susceptible to neem oil when compared to the fourth nymphal stage.
Ano de Publicação: 2009
Aparece nas coleções:Artigo em periódico indexado (AI-SEDE) / Embrapa Informação Tecnológica (SCT)

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