The aim of the present study was to investigate the parasitism of two fruit fly species by different Diachasmimorpha longicaudata strains. Females of two parasitoid strains were reared on Ceratitis capitata or Anastrepha fraterculus that were conditioned in adapted containers. Individual parasitoids were offered 20 larvae for 1 h, using no-choice (20 C. capitata or 20 A. fraterculus) or free-choice (10 of each species) assays. Parasitism was verified by counting scars, and the pupae were classified as non-parasitized (no scars), parasitized (one scar), or superparasitized (multiple scars). Parasitism intensity was compared by evaluating the proportions of non-parasitized, parasitized, and superparasitized larvae. Parasitism intensity and scar frequency were analyzed as functions of host species and parasitoid strain, using chi-square tests. In the non-choice tests, females of both parasitoid strains parasitized the larvae, regardless of host species. However, when the parasitoids had a choice, they preferred to superparasitize A. fraterculus larvae, which are larger than C. capitata larvae. In addition, the female parasitoids parasitized most of the host larvae, regardless of parasitoid strain or host species. However, the frequency of non-parasitized pupae was higher when the offered host species was different from the one in which the parasitoid was reared, and the frequency of superparasitized pupae was higher when the offered host species was the same as the one in which the parasitoid was reared.
<p>Objetivou-se, com este trabalho, amostrar e reconhecer a dinâmica populacional de insetos-praga presentes em tomate industrial na região Norte Mineira, no município de Itacarambi. Amostraram-se semanalmente dez pontos aleatórios e, em cada ponto quatro plantas, semanalmente; com base no procedimento padrão sugerido para o MIP tomateiro. Foram avaliados: transmissores de viroses: pulgões, mosca branca e tripes; minadores de folha: traça-do-tomateiro e mosca minadora. Observou-se a ocorrência de mosca branca durante todo o período de coleta. Na primeira quinzena do ciclo da cultura houve maior população de tripes. Observou-se a presença populacional de Cigarrinha (<em>Empoasca </em>sp) no início do ciclo da cultura; e aumento populacional de Tripes na segunda quinzena da cultura. Outras pragas-chave para a cultura do tomateiro como pulgões e traças não foram observados nas coletas. As informações deste trabalho permitem direcionar as táticas de controle para os períodos em que as populações dos insetos-praga são mais elevadas.</p> <p><strong>Palavras-chave:</strong> <em>Solanum lycopersicum</em>, manejo integrado de pragas, mosca branca.</p>
AbSTRACT-This paper aimed to evaluate the occurrence of Gonodonta larvae defoliating sugar apple (Annona squamosa) and atemoya fruits (Annona squamosa x Annona cherimolia L. Mill.) in northern state of Minas Gerais. Larvae were collected between December 2007 and January 2008 in Annonaceae plantation in the rural area of the municipality of Janaúba, MG. Adults obtained have been sent for identification. The species identified were Gonodonta bidens Geyer, G. nutrix Stoll and G. pyrgo Cramer. The infestation level observed in the orchard was 85% of plants with the presence of Gonodonta larvae and the average defoliation percentage was 30%. These are the first records of Gonodonta species defoliating sugar apple and atemoya in Brazil.
<p>Objetivou-se, com este trabalho, amostrar e reconhecer a dinâmica populacional de insetos-praga presentes em tomate industrial na região Norte Mineira, no município de Itacarambi. Amostraram-se semanalmente dez pontos aleatórios e, em cada ponto quatro plantas, semanalmente; com base no procedimento padrão sugerido para o MIP tomateiro. Foram avaliados: transmissores de viroses: pulgões, mosca branca e tripes; minadores de folha: traça-do-tomateiro e mosca minadora. Observou-se a ocorrência de mosca branca durante todo o período de coleta. Na primeira quinzena do ciclo da cultura houve maior população de tripes. Observou-se a presença populacional de Cigarrinha (<em>Empoasca </em>sp) no início do ciclo da cultura; e aumento populacional de Tripes na segunda quinzena da cultura. Outras pragas-chave para a cultura do tomateiro como pulgões e traças não foram observados nas coletas. As informações deste trabalho permitem direcionar as táticas de controle para os períodos em que as populações dos insetos-praga são mais elevadas.</p> <p><strong>Palavras-chave:</strong> <em>Solanum lycopersicum</em>, manejo integrado de pragas, mosca branca.</p>
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