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      Biology of Microctonus sp. (Hymenoptera: Braconidae), a parasitoid of Cyrtomon luridus BOH. (Coleoptera: Ccurculionidae) Translated title: Biologia de Microctonus sp. (Hymenoptera: Braconidae), parasitóide de Cyrtomon luridus BOH. (Coleoptera: Curculionidae)

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          Abstract

          Cyrtomon luridus (Boh.), a native insect of wild Solanaceae, has adapted to the medicinal plant Duboisia sp., introduced from Australia, causing damages up to 100% mortality. Microctonus sp. is the most important natural enemy of C. luridus and its potential for biological control was investigated in this work. This study was carried out in Arapongas, Paraná State, Brazil, from 1994 to 1996. Parasitism of C. luridus by Microctonus sp. was highest from February through June (maximum of 54% in May 1996), when the C. luridus adult population was decreasing. The female sex ratio of Microctonus sp. under natural conditions was 0.57 to 0.69, which was close to 1 male : 2 female. Production of males occurs parthenogetically (arrhenotoky). In the laboratory, parasitism reached 40% when two adult C. luridus were exposed per parasitoid. The number of Microctonus sp. adults that emerged per parasitized beetle ranged from 4.7 to 14.2. Larval-pupal viability was 31.7 to 64.8% and the female sex ratio ranged from 0.0 to 0.37, with prevalence of males. The egg-pupal period was 12.7 days and the pupal-adult period was 10.7 days, resulting in a mean life cycle (egg-adult) of 22.4 days for this parasitoid (25ºC, 70% R.H.). This is the first report of a new species of Microctonus sp. in C. luridus.

          Translated abstract

          Cyrtomon luridus (Boh.) é um inseto nativo de solanáceas silvestres e se adaptou à planta medicinal Duboisia sp., introduzida da Austrália, causando danos de até 100% de mortalidade. Microctonus sp. é o mais importante inimigo natural de C. luridus e seu potencial para o controle biológico foi investigado neste trabalho. Os experimentos foram conduzidos em Arapongas, Estado do Paraná, de 1994 a 1996. O parasitismo de C. luridus, por Microctonus sp. foi maior nos meses de fevereiro a junho (máximo de 54% em maio/96), coincidindo com a diminuição da população de adultos de C. luridus. A razão sexual de fêmeas de Microctonus sp., em condições naturais, foi de 0,57 a 0,69; sem cópula há produção de machos (partenogênese arrenótoca). Em laboratório, o parasitismo chegou a 40%, quando se ofereciam 2 adultos de C. luridus para 1 parasitóide. O número de adultos de Microctonus sp. por besouro parasitado variou de 4,7 a 14,2; a viabilidade larval-pupal de 31,7 a 64,8% e a razão sexual de 0 a 0,37, com predominância de machos. O período ovo-adulto foi em média, de 22,4 dias, sendo 12,7 dias para o período ovo-pupa e 10,7 dias para o período pupa-adulto (a 25º C; 70% de U.R). Estes foram os primeiros resultados da biologia desta nova espécie de Microctonus, parasitóide com potencial a ser avaliado para o controle biológico de C. luridus.

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          Seasonal Biology and Ecology in New Zealand of Microctonus aethiopoides (Hymenoptera: Braconidae), a Parasitoid of Sitona Spp. (Coleoptera: Curculionidae), with Special Emphasis on Atypical Behaviour

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            Revisión sistemática del género Cyrtomon Schönherr (Coleoptera: Curculionidae)

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              Domestication and crop development of Duboisia spp. (Solanaceae)

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                sa
                Scientia Agricola
                Sci. agric. (Piracicaba, Braz.)
                São Paulo - Escola Superior de Agricultura "Luiz de Queiroz" (Piracicaba )
                1678-992X
                October 2004
                : 61
                : 5
                : 538-541
                Affiliations
                [1 ] Solana Agropecuária Ltda Brasil
                [2 ] Universidade de São Paulo Brazil
                Article
                S0103-90162004000500012
                10.1590/S0103-90162004000500012
                ec067657-c4eb-424e-bf85-7a245bc99d99

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0103-9016&lng=en
                Categories
                AGRICULTURE, MULTIDISCIPLINARY

                General agriculture
                biological control,parasitism,medicinal plant,duboisia,controle biológico,parasitismo,planta medicinal

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