Capacidade de Busca e de Parasitismo de Cotesia flavipes Cameron (Hymenoptera: Braconidae) em Lagartas de Diatraea saccharalis (Fabricius) (Lepidoptera: Crambidae)

Luan Alberto Odorizzi Santos, Laila Herta Mihsfeldt

Abstract


A capacidade do parasitoide de localizar e parasitar o hospedeiro estão diretamente relacionados ao sucesso do controle biológico de pragas. Diante disso, o presente trabalho avaliou o efeito da idade de Cotesia flavipes Cameron na capacidade busca e no parasitismo em lagartas de Diatraea saccharalis (Fabricius) em condições de laboratório. Realizou-se uma liberação de 2000 parasitoides com 24 horas de idade. Foram colocados 40 internódios infestados artificialmente com a broca, na distância de cinco e dez metros, num total de 80 colmos por avaliação, durante seis dias. Constatou-se que no primeiro dia de liberação houve a maior porcentagem de parasitismo, diferindo apenas do quinto e sexto dia. Conclui-se que C. flavipes pode parasitar até 120 horas de vida em condições de laboratório e recomenda-se a liberação de indivíduos com 24 horas de vida por apresentarem maior percentual de parasitismo nessa idade.


Ability to Quest and Parasitism of Cotesia flavipes Cameron (Hymenoptera: Braconidae) on Diatraea saccharalis (Fabricius) (Lepidoptera: Crambidae) Larvae


Abstract. The ability of the parasitoid to locate and parasitize the host is directly related to the success of biological control of pests. The effect of Cotesia flavipes Cameron’s age on the ability to quest and parasitism larvae of Diatraea saccharalis (Fabricius) in laboratory conditions was evaluated. An amount of 2,000 adults (24 hours aged) was released. Fourteen sugarcane borer artificially infested internodes were 5 and 10 m placed apart each other, comprising eighteen stalks in each evaluation, during six days. The higher parasitism rate was observed in the first day after parasitoid release, with significant differences from the fifth day on. Therefore, C. flavipes is able to efficiently parasitize until its first 120 hours of life in laboratory conditions. It makes possible a recommendation of 24-hours aged parasitoid releases, that possibly will be more efficient in the sugarcane borer biological control.


Keywords


Broca-da-cana; Controle Biológico; Infestação Artificial; Parasitoide larval;Artificial Infestation; Biological Control; Parasitoids; Sugarcane borer.

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