title: Lethal and sublethal effects of lufenuron on sugarcane borer Diatraea flavipennella and its parasitoid Cotesia flavipes.
abstract: The combination of chemical and biological controls is a historic goal of integrated pest management, but has rarely been achieved due to lethal and sublethal impact of insecticides on natural enemies altering their performance. In this context, the susceptibility of the yellow sugarcane borer, Diatraea flavipennella (Lepidoptera: Crambidae), to the insect growth regulator lufenuron and the consequent effects upon its endoparasitoid Cotesia flavipes (Hymenoptera: Braconidae) encountering exposed but surviving larvae were studied. Neonate and 10-day-old larvae were subjected to one of seven concentrations of lufenuron (1.56, 3.12, 6.25, 12.5, 25.0, 50.0 and 100 mg a.i./L). Further, effects of lufenuron to the host larvae and to the parasitoid were assessed using low lethal LC20 and LC50. Lufenuron at concentrations up to 12.5 mg a.i./L allowed partial survival of borer larvae; and concentrations over 12.5 mg a.i./L caused 100 % larval mortality before pupation in both ages. Neonate larvae exhibited lower pupal weights only at concentrations 12.5 mg a.i./L; while 10-day-old larvae treated with the LC50 exhibited delayed development. Egg viability was reduced for adult borers from surviving larvae of both ages treated with low lethal concentrations. The parasitoid C. flavipes successfully parasitized surviving low lethal treated larvae. Among the studied life history characteristics of C. flavipes, only a delayed development was observed. The results showed that lufenuron can be effective against D. flavipennella at concentrations over 25 mg a.i./L, and that surviving larvae can be successfully parasitized by C. flavipes. The insecticide lufenuron and the parasitoid C. flavipes seem to be compatible for sugarcane borer control.
authors.affiliation: Departamento de Agronomia - Entomologia, Universidade Federal Rural de Pernambuco, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, Recife, PE, 52171-900, Brazil.
authors.forename: Ana Paula Pereira
authors.initials: AP
authors.lastname: Fonseca
authors.affiliation: Departamento de Agronomia - Entomologia, Universidade Federal Rural de Pernambuco, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, Recife, PE, 52171-900, Brazil.
authors.forename: Edmilson Jacinto
authors.initials: EJ
authors.lastname: Marques
authors.affiliation: Departamento de Agronomia - Entomologia, Universidade Federal Rural de Pernambuco, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, Recife, PE, 52171-900, Brazil. jtorres@depa.ufrpe.br.
authors.forename: Jorge Braz
authors.initials: JB
authors.lastname: Torres
authors.affiliation: Departamento de Agronomia - Entomologia, Universidade Federal Rural de Pernambuco, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, Recife, PE, 52171-900, Brazil.
authors.forename: Liliane Marques
authors.initials: LM
authors.lastname: Silva
authors.affiliation: Departamento de Agronomia - Entomologia, Universidade Federal Rural de Pernambuco, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, Recife, PE, 52171-900, Brazil.
authors.forename: Herbert Álvaro Abreu
authors.initials: HÁ
authors.lastname: Siqueira
mesh_terms: D000818:Animals; D001549:Benzamides / Q000494:pharmacology* / Q000633:toxicity; D004305:Dose-Response Relationship, Drug; D006790:Host-Parasite Interactions / Q000187:drug effects; D007300:Insect Control; D007306:Insecticides / Q000494:pharmacology* / Q000633:toxicity; D007605:Juvenile Hormones / Q000494:pharmacology* / Q000633:toxicity; D007814:Larva / Q000187:drug effects / Q000254:growth & development / Q000469:parasitology / Q000502:physiology; D009036:Moths / Q000187:drug effects* / Q000254:growth & development / Q000469:parasitology; D010572:Pest Control, Biological; D014863:Wasps / Q000187:drug effects* / Q000254:growth & development / Q000502:physiology; D005466:Fluorocarbons
chemical_list: D001549:Benzamides; D007306:Insecticides; D007605:Juvenile Hormones; C070364:fluphenacur; D005466:Fluorocarbons
keywords: Biological control; Ecotoxicology; Insect growth regulator; Integrated pest management; Transgenerational effects