Sexual ratio modulation of Campoletis flavicincta (Hymenoptera: Ichneumonidae) in artificial rearing

Published 2017-10-06

Authors

  • Leandro Prado Ribeiro
    Epagri/Centro de Pesquisa para Agricultura Familiar (Cepaf)
  • Sônia Thereza Bastos Dequech
    Bióloga, Doutora, Professora Adjunta (aposentada), Departamento de Defesa Fitossanitária, Universidade Federal de Santa Maria (UFSM)
  • Rogério Fernando Pires da Silva
    Engenheiro-agrônomo, Doutor, Professor Adjunto (aposentado), Departamento de Fitossanidade, Universidade Federal do Rio Grande do Sul (UFRGS)
  • Lidia Mariana Fiuza
    Engenheira-agrônoma, Doutora, Professora Adjunta, Centro de Ciências da Saúde, Universidade do Vale do Rio dos Sinos (UNISINOS)

Abstract

Abstract - The objective of the present study was to evaluate laboratorial proceedings able to modify the sexual ratio of Campoletis flavicincta (Hym., Ichneumonidae) in mass rearing. Couples of C. flavicincta, with known age, had been individualized and kept in controlled conditions. Larvae of Spodoptera frugiperda (Lep., Noctuidae) were offer to the parasitoids, in the following proceedings of rearing, with reference, between parenthesis, to the obtained sexual ratio: couples formed 24 hours before being larvae offered (0,18) and without that previous period (0,20); offering larvae of 2nd (0,19) or 3rd instar (0,18); and female age from the parasitoids couples: 0-2 days (0,19), between 3-6 days (0,22), from 7-10 days (0,20) and higher than 10 days (0,13). The results did not differ significantly by chi-square test at 5% significance. A complementary assay was carried out, congregating the conditions that had propitiated the higher absolute ratios of females: pairs formed at the moment of larvae offering, larvae of 2nd instar of S. frugiperda and parasitoid females with age between 3 to 6 days. In these conditions, an average sexual ratio of 0,41 was obtained, without modifying the parasitoid biological characteristics.

Author Biography

  • Leandro Prado Ribeiro
    Engenheiro-Agrônomo pela Universidade Federal de Santa Maria (2008). Obteve, em 2011, o título de mestre em Entomologia pela Escola Superior de Agricultura "Luiz de Queiroz"/Universidade de São Paulo (ESALQ/USP) e, em 2014, o título de doutor em Entomologia pela ESALQ/USP com período sanduíche no Insect Toxicology Laboratory, Faculty of Land and Food Systems/University of British Columbia, Vancouver, Canadá. Atualmente é pesquisador (ATFS4) em Entomologia do Centro de Pesquisa para Agricultura Familiar/Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (CEPAF/EPAGRI). (CV lattes: http://lattes.cnpq.br/3336925010648086)

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    Keywords

    • Spodoptera frugiperda
    • parasitoids
    • mass rearing
    • biological control