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Anais da Sociedade Entomológica do Brasil

Print version ISSN 0301-8059On-line version ISSN 1981-5328

An. Soc. Entomol. Bras. vol.28 no.2 Londrina June 1999

https://doi.org/10.1590/S0301-80591999000200024 

SCIENTIFIC NOTE

 

Natural enemies of Nomophila sp. (Lepidoptera: Pyralidae), a cut-worm of Eucalyptus grandis (Myrtaceae) seedlings in Viçosa, Minas Gerais, Brazil

 

Inimigos naturais de Nomophila sp. (Lepidoptera: Pyralidae), uma lagarta-rosca de mudas de Eucalyptus grandis (Myrtaceae) em Viçosa, Minas Gerais

 

 

José C. ZanuncioI; César A. D. TeixeiraI,II; Marcos F. SossaiI

IDepto. de Biologia Animal, Universidade Federal de Viçosa, 36571-000, Viçosa, MG; e-mail: zanuncio@mail.ufv.br
2Embrapa Rondônia, Caixa Postal 406, 78900-000, Porto Velho, RO

 

 


RESUMO

A lagarta-rosca Nomophila sp. (Lepidoptera: Pyralidae) é considerada a principal praga em viveiros de Eucalyptus grandis em Viçosa, Minas Gerais. Durante um surto dessa praga, foram coletados e identificados os seguintes inimigos naturais da mesma: os parasitóides Diplazon laetatorius (Fab.), Eiphosoma sp. e duas espécies das tribos Porizontini e Mesostenini, da família Ichneumonidae (Hymenoptera), e duas espécies da família Braconidae (Hymenoptera). Além dessas, foram coletados adultos predadores, pertencentes à família Forficulidae (Dermaptera), cujas espécies não foram ainda identificadas. Mesmo com a presença desses parasitóides e do predador, o número de indivíduos de Nomophila sp. permaneceu acima do nível de dano econômico, o que tornou necessária a aplicação de produto químico para o controle dessa praga.

Palavras-chave: Insecta, controle biológico, predador, parasitóide, viveiro de mudas


 

 

During the nursery stage, the most important pests of Eucalyptus seedlings are the cut-worm caterpillars (Anjos et al. 1986), including Nomophila sp. (Lepidoptera: Pyralidae), which has been the main species of this group attacking Eucalyptus grandis seedlings in Viçosa, Minas Gerais, Brazil. Nomophila noctuella (Schif.) (Lepidoptera: Pyralidae) had been observed in the States of Rio Grande do Sul (Silva et al. 1968) and São Paulo (Berti Filho 1981). An important characteristic of N. noctuella is that it can be airborne transported for up to 2,500 km (Wolff 1975). The number of generations of this species can be different according to the region but in most places two to four generations a year have been observed. In temperate areas this pest can hibernate during the winter as partial or fully developed caterpillars in a tunnel built in the superficial part of the litter. N. noctuella is polyphagous and can feed on cultivated horticulture species, besides annual and forest plants. Due to the heavy damage caused by Nomophila sp. in E. grandis seedlings, caterpillars of this species and its natural enemies were collected during the months of November and December of 1986, in the seedling producing area of the Instituto Estadual de Florestas (IEF) located in the campus of the Universidade Federal de Viçosa (UFV), in Viçosa. Nomophila sp. caterpillars were brought to the laboratory where they were fed with E. grandis seedlings produced in the IEF nursery. Nomophila sp. adults were collected from January to March 1987 at the same local with light traps, and brought to laboratory where they were fed with bee honey diluted in distilled water at the proportion 1:4 (Silva 1980) aiming to keep a stock rearing of this pest in laboratory.

Predators collected in the E. grandis nursery and parasitoids emerged in the laboratory were sent to the Center for Identification of Phytophagous Insects (CIIF), of the Universidade Federal do Paraná, in Curitiba, Paraná, Brazil for taxonomic determination. Parasitoids of Nomophila sp. collected in Viçosa were identified as Diplazon laetatorius (Fab.), Eiphosoma sp. and two species of the Porizontini and Mesostenini tribes, all of them belonging to the Ichneumonidae family (Hymenoptera). Besides these species, two other parasitoids of the Braconidae family (Hymenoptera) and one predator species of the Forficulidae family (Dermaptera) were obtained, but their identification at the species level was not possible.

Specimens of Nomophila sp. and of its natural enemies were deposited in the Museum of Entomology of the Universidade Federal de Viçosa, in Viçosa, Minas Gerais, Brazil.

Field observations showed low impact of the parasitoids and the predator on the population of Nomophila sp., since even in their presence the damage caused by this pest was high, making necessary the application of insecticides.

 

Acknowledgements

To the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and to the Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG).

 

Literature Cited

Anjos, N., G. P. Santos & J. C. Zanuncio. 1986. Pragas do eucalipto e seu controle. Inf. Agropec. 141: 50-58.         [ Links ]

Berti Filho, E. 1981. Insetos associados às plantações do gênero Eucalyptus nos estados da Bahia, Espírito Santo, Mato Grosso do Sul, Minas Gerais e São Paulo. Tese de Livre Docência, ESALQ/USP, Piracicaba, 176p.         [ Links ]

Silva, A. G. A., C. R. Gonçalves, D. M. Galvão, A. J. L. Gonçalves, J. Gomes, M. M. Silva & L. Simoni. 1968. Quarto catálogo dos insetos que vivem nas plantas do Brasil-seus parasitos e predadores. Parte II, 1º Tomo, Min. Agricultura, Rio de Janeiro, 622p.         [ Links ]

Silva, N.A. 1980. Biologia de Sabulodes caberata caberata Guenée, 1857 (Lepidoptera: Geometridae) em Eucalyptus spp. (Myrtaceae) e ocorrência de inimigos naturais. Piracicaba, ESALQ/USP, Dissertação de Mestrado, 113p.         [ Links ]

Wolff, N. L. 1975. The Nomophila species (Lepidoptera: Pyralidae) found in the North Atlantic area. Entomol. Medd., Kjbenharn, 3: 128-35.         [ Links ]

 

 

Received 04/XI/98. Accepted 12/III/99.

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