Virulence of entomopathogenic nematodes (Rhabditida: Steinernematidae and Heterorhabditidae) for the control of Diabrotica speciosa germar (coleoptera: chrysomelidae) Virulência de nematoides entomopatogênicos (Rhabditida: Steinernematidae e Heterorhabditidae) para o controle de Diabrotica speciosa germar (coleoptera: chrysomelidae)
Entomopathogenic nematodes (EPNs) are used in biological control of soil insects and show promise in the control of D. speciosa. The objective of this work was to evaluate the potential of native and exotic entomopathogenic nematode isolates in the control of D. speciosa under laboratory and greenho...
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Published in | Ciência e agrotecnologia Vol. 35; no. 6; pp. 1149 - 1156 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
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Universidade Federal de Lavras
01.12.2011
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Abstract | Entomopathogenic nematodes (EPNs) are used in biological control of soil insects and show promise in the control of D. speciosa. The objective of this work was to evaluate the potential of native and exotic entomopathogenic nematode isolates in the control of D. speciosa under laboratory and greenhouse conditions. Results showed that all of EPNs caused larval mortality. The most virulent were Heterorhabditis sp. RSC01 (94%), Steinernema glaseri (84%), Heterorhabditis sp. JPM04 (82%) and Heterorhabditis amazonensis RSC05 (78%). There was no effect of the Heterorhabditis sp. RSC01 and S. glaseri isolates on eggs. The maximum mortality of D. speciosa larvae by Heterorhabditis sp. RSC01 was observed at a concentration of 300 IJ/ insect, while by S. glaseri observed the highest mortality at the concentration of 200 IJ/ insect. The Heterorhabditis sp. RSC01 isolate caused over 80% pupal mortality at a concentration of 250 IJ/insect. The virulence of Heterorhabditis sp. RSC01 and S. glaseri was affected by temperature. The Heterorhabditis sp. RSC01 isolate caused reduction in larva survival under greenhouse conditions at all of the tested concentrations and there was no difference in mortality among different concentrations of infectid juveniles.Os nematóides entomopatogênicos são utilizados no controle biológico de pragas de solo, e são promissores para o controle de D. speciosa. Neste trabalho, objetivou-se avaliar o potencial de espécies nativas e exóticas de isolados de nematóides entomopatogênicos para o controle de D. speciosa, em condições de laboratório e de casa de vegetação. Verificou-se que todos os nematóides causaram mortalidade larval. Os mais virulentos foram Heterorhabditis sp. RSC01 (94%), Steinernema glaseri (84%), Heterorhabditis sp. JPM04 (82%) e Heterorhabditis amazonensis RSC05 (78%). Não houve efeito dos isolados Heterorhabditis sp. RSC01 e S. glaseri em ovos. A mortalidade máxima de larvas de D. speciosa por Heterorhabditis sp. RSC01 foi observada na concentração de 300 JI / inseto, enquanto para S. glaseri a maior mortalidade foi obervada na concentração de 200 JI/ inseto. O isolado Heterorhabditis sp. RSC01 causou mais de 80% de mortalidade de pupas na concentração de 250 IJ/ inseto. A virulência de Heterorhabditis sp. RSC01 e S. glaseri foi afetada pela temperatura. O isolado Heterorhabditis sp. RSC01 causou redução na sobrevivência da larvas em casa de vegetação em todas as concentrações de juvenis infectantes testadas e não houve diferença na mortalidade entre os diferentes tratamentos. |
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AbstractList | Entomopathogenic nematodes (EPNs) are used in biological control of soil insects and show promise in the control of D. speciosa. The objective of this work was to evaluate the potential of native and exotic entomopathogenic nematode isolates in the control of D. speciosa under laboratory and greenhouse conditions. Results showed that all of EPNs caused larval mortality. The most virulent were Heterorhabditis sp. RSC01 (94%), Steinernema glaseri (84%), Heterorhabditis sp. JPM04 (82%) and Heterorhabditis amazonensis RSC05 (78%). There was no effect of the Heterorhabditis sp. RSC01 and S. glaseri isolates on eggs. The maximum mortality of D. speciosa larvae by Heterorhabditis sp. RSC01 was observed at a concentration of 300 IJ/ insect, while by S. glaseri observed the highest mortality at the concentration of 200 IJ/ insect. The Heterorhabditis sp. RSC01 isolate caused over 80% pupal mortality at a concentration of 250 IJ/insect. The virulence of Heterorhabditis sp. RSC01 and S. glaseri was affected by temperature. The Heterorhabditis sp. RSC01 isolate caused reduction in larva survival under greenhouse conditions at all of the tested concentrations and there was no difference in mortality among different concentrations of infectid juveniles.Os nematóides entomopatogênicos são utilizados no controle biológico de pragas de solo, e são promissores para o controle de D. speciosa. Neste trabalho, objetivou-se avaliar o potencial de espécies nativas e exóticas de isolados de nematóides entomopatogênicos para o controle de D. speciosa, em condições de laboratório e de casa de vegetação. Verificou-se que todos os nematóides causaram mortalidade larval. Os mais virulentos foram Heterorhabditis sp. RSC01 (94%), Steinernema glaseri (84%), Heterorhabditis sp. JPM04 (82%) e Heterorhabditis amazonensis RSC05 (78%). Não houve efeito dos isolados Heterorhabditis sp. RSC01 e S. glaseri em ovos. A mortalidade máxima de larvas de D. speciosa por Heterorhabditis sp. RSC01 foi observada na concentração de 300 JI / inseto, enquanto para S. glaseri a maior mortalidade foi obervada na concentração de 200 JI/ inseto. O isolado Heterorhabditis sp. RSC01 causou mais de 80% de mortalidade de pupas na concentração de 250 IJ/ inseto. A virulência de Heterorhabditis sp. RSC01 e S. glaseri foi afetada pela temperatura. O isolado Heterorhabditis sp. RSC01 causou redução na sobrevivência da larvas em casa de vegetação em todas as concentrações de juvenis infectantes testadas e não houve diferença na mortalidade entre os diferentes tratamentos. |
Author | Alcides Moino Junior Vanessa Andaló Viviane Santos Ricardo Alves de Olinda Camila Costa Moreira |
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SubjectTerms | crisomelid beetle crisomelídeo Heterorhabditis pathogenicity patogenicidade Steinernema |
Title | Virulence of entomopathogenic nematodes (Rhabditida: Steinernematidae and Heterorhabditidae) for the control of Diabrotica speciosa germar (coleoptera: chrysomelidae) Virulência de nematoides entomopatogênicos (Rhabditida: Steinernematidae e Heterorhabditidae) para o controle de Diabrotica speciosa germar (coleoptera: chrysomelidae) |
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