| Autor: |
Silva RBD; Programa de Pós-Graduação em Biotecnologia e Gestão da Inovação, Centro Universitário de Sete Lagoas, Departamento de Ciências Biológicas, Avenida Marechal Castelo Branco, 2765, Santo Antônio, 35701-242 Sete Lagoas, MG, Brazil., Cruz I; Embrapa Milho e Sorgo, Rodovia MG 424, Km 45, Caixa Postal 151, 35701970 Sete Lagoas, MG, Brazil., Figueiredo MLC; Instituto Mineiro de Agropecuária, Coordenadoria Regional de Patrocínio, Avenida João Alves do Nascimento, 1353, 3º andar, 36740-000 Patrocínio, MG, Brazil., Redoan ACM; Embrapa Milho e Sorgo, Rodovia MG 424, Km 45, Caixa Postal 151, 35701970 Sete Lagoas, MG, Brazil., Shimbori EM; Universidade de São Paulo, Escola Superior de Agricultura 'Luiz de Queiroz', Departamento de Entomologia e Acarologia, Avenida Pádua Dias, 11, Caixa Postal 9, 13418-900 Piracicaba, SP, Brazil., Tavares WS; PT. Itci Hutani Manunggal (IHM), Balikpapan, East Kalimantan, 76134, Indonesia., Dias AMPM; Universidade Federal de São Carlos, Departamento de Ecologia e Biologia Evolutiva, Rodovia Washington Luiz, Km 235, Caixa Postal 676, 13565-905 São Carlos, SP, Brazil. |
| Abstrakt: |
The corn cropping system can influence the natural enemy identity and the number of Spodoptera frugiperda J.E. Smith, 1797 (Lepidoptera: Noctuidae) individuals infesting the cartridge, ear and stem of this plant. The objectives were to identify the S. frugiperda natural enemies and differences in the number of individuals infesting the cartridge, ear and stem of corn plants under conventional and organic cropping systems, in Brazil after an initial collection of adult males through semiochemical traps. We also evaluated key morphometrical parameters of the larva and factors contributing with the viability of S. frugiperda. A total of 16 and 136 adult males was trapped, and 1,124 and 1,112 larvae was recovered from conventional and organic systems with 4.7 and 6.7% of them parasitized by dipteran and hymenopteran, respectively. Most of the parasitoids recovered had occurrence in both cropping systems, except Cremastinae and Ophion flavidus Brullé, 1846 (Hymenoptera: Ichneumonidae), which were recorded only in organic and Campoletis sp. (Hymenoptera: Ichneumonidae) only in conventional corns. The number of parasitoids recovered was similar in corn plant samples between both cropping systems. A total of 152 and 31 larvae was recovered from corn ears under conventional and organic systems, respectively. Doru luteipes (Scudder, 1876) (Dermaptera: Forficulidae) was recovered from all samples under conventional system. The larva length was overall similar between cropping systems. Parasitism by dipteran and hymenopteran, infection by microorganisms, larva mortality by undetermined causes, and differences in viability of S. frugiperda stages were factors contributing with the supression of this pest. The new associations and parasitoids reported represent possibilities of expanding the biological control strategies to manage S. frugiperda in corn crops. |
