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      Resposta funcional de Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) parasitando ovos de Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae): efeito da idade do hospedeiro Translated title: Functional response of Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) to Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) eggs: effect of host age

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          Abstract

          Estudou-se a resposta funcional de Trichogramma pretiosum Riley parasitando ovos de Tuta absoluta (Meyrick) com idades de 12 a 36, 36 a 60 e > 60 h, em folhas de tomate industrial IPA-5, com exposição dos ovos a uma fêmea pelo período de um dia. A partir do número de ovos parasitados em diferentes densidades foi feita a linearização do parasitismo por meio da equação de Woolf, obtendo-se desta o tempo de manipulação (Th) de 0,77 h e a taxa de ataque (a') de 0,80 h-1. Baseando-se nesses resultados, testou-se o tipo de resposta apresentada pelo parasitóide que se ajustou melhor ao Tipo II: Na = Nt [1 - exp (-0,80/(1+0,0258Nt))], para ovos de 12 a 36 h de idade. O número máximo estimado de ovos parasitados foi de 31,1, próximo ao número observado de 30 ovos parasitados na densidade de 60 ovos por folíolo. O Th correspondeu a 3,22% do tempo total de exposição. Um aumento na taxa de parasitismo foi observado até a densidade de 55 ovos/folíolo, caracterizando uma resposta funcional do Tipo I para baixas densidades [ÿ = 4,53 + 0,288 (± 0,054)x], enquanto que em altas densidades, a taxa de parasitismo foi estável nas densidades de 56 a 80 e de 81 a 100 ovos/folíolo (média ± DP = 20,1 ± 4,01 ovos). Em ovos com idades de 36 a 60 ou > 60 h, o parasitóide não apresentou incremento de parasitismo significativo com a densidade.

          Translated abstract

          The functional response of Trichogramma pretiosum Riley parasitizing Tuta absoluta (Meyrick) eggs on industrial var. IPA-5 tomato leaves was studied for individual females at 12-36, 36-60 and > 60 h old eggs during one day exposition time. The handling time (Th = 0.77 h) and attack rate (a' = 0.80 h-1) were obtained from the linearization of parasitism by means of Woolf's equation. Based on these results, the functional response fitted the Type II: Na = Nt [1 - exp (-0,80 / (1 + 0,0258Nt))], but only when eggs were 12-36 h old. The estimated maximum number of parasitized eggs was 31.1, while the maximum observed number was 30, at the egg density of 60. The Th was 3.22% of the total exposure time. The increase in parasitism was up to 55 eggs/leaflet density, showing a Type I functional response for lower egg densities [ÿ = 4.53 + 0.288 (± 0.054)x], while in higher densities the parasitism was stable and similar to that achieved at the 56-80 and 81-100 eggs/leaflet densities (mean ± SD = 20.1 ± 4.01 eggs). Increase in host density was not followed by increase in parasitism for eggs 36-60 h old and older than 60 h.

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          Most cited references29

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          Some Characteristics of Simple Types of Predation and Parasitism

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            Random Search and Insect Population Models

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                aseb
                Anais da Sociedade Entomológica do Brasil
                An. Soc. Entomol. Bras.
                Sociedade Entomológica do Brasil (Londrina )
                1981-5328
                March 2000
                : 29
                : 1
                : 85-93
                Affiliations
                [1 ] Universidade Federal de Pernambuco Brazil
                [2 ] Universidade Federal de Pernambuco Brazil
                Article
                S0301-80592000000100011
                10.1590/S0301-80592000000100011
                580ac0b0-6f46-4b0a-8a2b-a472a127ef53

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

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0301-8059&lng=en
                Categories
                AGRICULTURE, MULTIDISCIPLINARY

                General agriculture
                Insecta,tomato leafminer,biological control,egg parasitoid,parasitism rate,traça-do-tomateiro,controle biológico,parasitóide de ovos,taxa de parasitismo

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