Neem oil antifeedant and insecticidal effects on Oebalus poecilus (Hemiptera: Pentatomidae) males and females

Efeito inseticida e deterrente do óleo de nim em machos e fêmeas de Oebalus poecilus (Hemiptera: Pentatomidae)

PROTEÇÃO DE PLANTAS

Neem oil antifeedant and insecticidal effects on Oebalus poecilus (Hemiptera: Pentatomidae) males and females

Efeito inseticida e deterrente do óleo de nim em machos e fêmeas de Oebalus poecilus (Hemiptera: Pentatomidae)

Patricia Valle Pinheiro; Eliane Dias Quintela

Empresa Brasileira de Pesquisa Agropecuária, Embrapa Arroz e Feijão, Santo Antônio de Goiás, GO, Brasil. E-mails: [e-mail], [e-mail]

ABSTRACT

The antifeedant and insecticidal effects of two commercial neem (Azadirachta indica) oil formulations (Dalneem and Nim-I-Go) to Oebalus poecilus were evaluated on irrigated rice. To evaluate the antifeedant effect, both formulations were tested at 1% and 2% (v/v) concentration levels. The insecticidal effect was evaluated at 0.5%, 1%, 2%, and 4% (v/v) concentrations of Dalneem, by ingestion. Both experiments were conducted with four replications by treatment, containing one panicle and adult insects segregated by gender (two insects per plot for the antifeedant effect and five for the insecticidal effect). Both products were efficient, reducing the damage caused by insects. Insects fed less on the panicles treated with neem oil, causing lower number of feeding sheaths per panicle and lower percentage of damaged grains than the control. Spikelets weight was higher in panicles treated with neem oils. Females caused significantly higher damage than males in controls, for numbers of feeding sheaths and for the feeding deterrence index. Only at the 4% (v/v) concentration level, Dalneem caused adult mortality higher than in the control. Results showed that neem oil formulations, at > 1% (v/v) concentration, can be used to reduce the quantitative and qualitative damages caused by O. poecilus in lowland rice.

Key-Words: Small rice stink bug; Azadirachta indica; qualitative damages; Oryza sativa; botanical extract.

RESUMO

Avaliou-se o efeito das formulações comerciais de óleo de nim (Azadirachta indica) Dalneem e Nim-I-Go sobre a alimentação e sobrevivência de O. poecilus, em arroz irrigado. O efeito sobre a alimentação foi avaliado nas concentrações de 1% e 2% (v/v) das formulações. O efeito inseticida foi avaliado nas concentrações de 0,5%; 1%; 2%; e 4% (v/v) de Dalneem, por ingestão. Os experimentos foram realizados com quatro repetições por tratamento, contendo uma panícula e insetos adultos separados por sexo (dois insetos por parcela, para o efeito sobre a alimentação, e cinco, para o efeito inseticida). Os dois produtos foram igualmente eficientes na redução dos danos causados pelos insetos. Os insetos alimentaram-se menos das panículas tratadas, causando menor número de bainhas de estilete/grão e menos grãos danificados do que no controle. A massa das espiguetas foi maior nas panículas tratadas. Na testemunha, as fêmeas causaram danos significativamente maiores que os machos, para número de bainhas de estilete e Índice de Deterrência da Alimentação. Apenas na concentração de 4% (v/v), o Dalneem causou mortalidade de adultos significativamente superior à da testemunha. Conclui-se que os óleos de nim testados, em concentrações > 1% (v/v), podem ser utilizados para reduzir os danos quantitativos e qualitativos causados por O. poecilus, em arroz.

Palavras-Chave: Percevejo da panícula; Azadirachta indica; danos qualitativos; Oryza sativa; extrato botânico.

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AKNOWLEDGEMENTS

We are grateful to Edson H. N. Vieira, Ana Lúcia Delalibera de Faria, and Nand Kumar Fageria, for reviewing the manuscript. To the laboratory team, we thank the supporting and dedication on the development of this study, especially to Edmar C. de Moura, José Francisco de A. e Silva, Genoquinha V. Machado, and Carlos H. R. da Silva.

Trabalho recebido em mar./2009 e aceito para publicação em nov./2010 (nº registro: PAT 5677/ DOI: 10.5216/pat.v40i4.5677).

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Publication Dates

• Publication in this collection
  30 Sept 2014
• Date of issue
  Dec 2010

History

• Accepted
  Nov 2010
• Received
  Mar 2009