Desempenho de Trichogramma pretiosum Riley e T. exiguum Pinto &amp; Platner (Hymenoptera: Trichogrammatidae) submetidos a diferentes densidades de ovos de Plutella xylostella (Lepidoptera: Plutellidae)

Pereira, Fabrício Fagundes; Barros, Reginaldo; Pratissoli, Dirceu

doi:10.1590/s0103-84782004000600001

Cited by 14 publications

(7 citation statements)

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“…The two other species, T. exiguum and T. atopovirilia, showed lower sex ratio values ranging from 0.71 to 0.87 and 0.72 to 0.78, respectively. Our results are consistent with sex ratio observed on other hosts: The sex ratio of T. exiguum ranged from 0.6 to 0.8 on Plutella xylostella eggs (Pereira et al 2004), and those of T. atopovirilia in E. aurantiana eggs (Molina et al 2005) were similar to our results. Based on sex ratio, H. virescens can be considered a suitable host for T. atopovirilia and T. exiguum because offspring sex ratios were female-biased (van Lenteren et al 2003).…”

Section: Discussionsupporting

confidence: 92%

Performance of four Trichogramma species (Hymenoptera: Trichogrammatidae) as biocontrol agents of Heliothis virescens (Lepidoptera: Noctuidae) under various temperature regimes

et al. 2011

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Trichogramma spp. are major parasitoids of lepidopteran pest eggs, but there is large variation in efficacy toward a given pest among the numerous described Trichogramma species. It is important to select the Trichogramma species that most effectively parasitize and develop in target pest eggs for biological control. In this context, Trichogramma pretiosum, T. exiguum, T. atopovirilia and T. acacioi were studied in Heliothis virescens eggs under different thermal conditions. The parasitoids were reared at constant temperatures of 20, 25 and 30°C and tested at these respective temperatures, while parasitoids reared at 25°C were also tested at 20 and 30°C, for a total of 20 species-temperature combinations. About 30 H. virescens eggs were offered to the parasitoids for 24 h. Among the four species, parasitism rate by T. atopovirilia was highest at all temperature conditions, whereas T. acacioi had the lowest rates of parasitism at 25°C and 25/30°C. Parasitism ranged from 13.8 to 43.8% among all species-temperature combinations. Viability (emerged parasitoids) ranged from 80.8 to 98.4%, and was deemed satisfactory. The emergence rates of T. exiguum and T. acacioi were affected by temperature. Temperature also affected the sex ratio of T. exiguum at 25/30°C, whereas T. pretiosum and T. acacioi produced females predominantly independent of temperature. Overall, the parasitoid T. atopovirilia was the most efficient in parasitizing H. virescens eggs, though the levels of parasitism obtained might not ensure its successful use in biological control programs. The temperature-related differences in biological traits observed in the four Trichogramma species tested hint at the importance of making careful choices regarding climatic conditions where the parasitoid is going to be used when selecting a species for biological control programs.

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Section: Discussionsupporting

confidence: 92%

Performance of four Trichogramma species (Hymenoptera: Trichogrammatidae) as biocontrol agents of Heliothis virescens (Lepidoptera: Noctuidae) under various temperature regimes

et al. 2011

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“…For each treatment, 50 newly emerged and mated female T. pretiosum wasps (24 to 36 h old) were transferred to individual microcentrifuge tubes (1.5 mL, 4.5 cm; Eppendorf, Hamburg, Germany) that contained a piece of cardboard (4.5 × 0.9 cm) with 30 E. kuehniella eggs (Pereira et al 2004;Zart et al 2012) and 1 drop of the respective diet solution. This procedure was repeated during 4 parasitoid generations.…”

Section: Bioassaysmentioning

confidence: 99%

Transgenic Insecticidal Crops and Natural Enemies: A Detailed Review of Laboratory Studies

Löveï¹,

2009

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“…(Zucchi et al 1989) e Alabama argillacea (Hueb.) em algodoeiro (Almeida 2000), Spodoptera frugiperda (J E Smith) em milho (Beserra & Parra 2003), Plutella xylostella (L.) em repolho (Pereira et al 2004a) e Tuta absoluta (Meyrick) em tomateiro .…”

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Parasitismo e superparasitismo de Trichogramma pretiosum Riley(Hymenoptera: Trichogrammatidae) em ovos de Sitotroga cerealella(Oliver) (Lepidoptera: Gelechiidae)

Moreira¹,

Santos²,

Beserra³

et al. 2009

Neotrop. entomol.

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-The parasitoid Trichogramma has been used worldwide as biological control agent due to its wide geographic distribution, high specialization and effi cacy against many lepidopteran pests. Biological and behavioral traits of Trichogramma pretiosum Riley parasitizing Sitotroga cerealella (Oliver) eggs were studied aiming to a better understanding of the results from parasitism and superparasitism. The variables investigated were: host acceptance and contact time by T. pretiosum on parasitized host, percentage of parasitoid emergence, number of deformed individuals produced, egg-adult period, sex ratio, offspring female body size and longevity, and number of S. cerealella eggs parasitized/female. Parasitism rejection was observed on parasitized host eggs after 24, 72 and 120h of parasitism. The rejection was higher for eggs parasitized after 72h and 120h of parasitism as compared to the eggs after 24h of parasitism. T. pretiosum contact time on eggs after 24h of parasitism was greater than on 72 and 120h. The offspring produced from hosts from which a single parasitoid emerged were larger, exhibited no deformities and greater capacity of parasitism, different from those produced from eggs where two parasitoids emerged. Offspring longevity, however, was similar for females emerged from hosts from which one or two adults emerged. In conclusion, T. pretiosum was able to recognize previously parasitized eggs and the superparasitism reduced the parasitoid.reproductive success.KEY WORDS: Biological control, egg parasitoid, host compatibility RESUMO -Parasitóides Trichogramma vêm sendo utilizados em todo o mundo como agentes de controle biológico devido à sua ampla distribuição geográfi ca, alta especialização e efi ciência no controle de muitas espécies-praga de lepidópteros. Para o entendimento dos resultados do parasitismo e superparasitismo de Trichogramma pretiosum Riley, estudaram-se os aspectos comportamentais e biológicos desse parasitóide sobre ovos de Sitotroga cerealella (Oliver). As variáveis investigadas foram: aceitação hospedeira e tempo de contato de T. pretiosum com o hospedeiro parasitado, porcentagem de emergência, porcentagem de indivíduos deformados, duração ovo-adulto, razão sexual, tamanho e longevidade de T. pretiosum e número de ovos de S. cerealella parasitados por fêmea descendente. Observou-se rejeição de parasitismo em ovos de S. cerealella previamente parasitados com 24, 72 e 120h de idade. A rejeição foi superior para ovos com 72h e 120h após o parasitismo em comparação com aqueles com 24h. Ovos previamente parasitados com 24h apresentaram maior tempo de contato por T. pretiosum comparados aos de 72h e 120h. Os descendentes oriundos de hospedeiros dos quais apenas um parasitóide se desenvolveu apresentaram-se todos maiores, sem deformidades e com maior capacidade de parasitismo, ao contrário dos indivíduos descendentes de hospedeiros em que dois parasitóides se desenvolveram. Entretanto, a longevidade de fêmeas descendentes não diferiu entre parasitóides oriundos de hospedeiros em ...

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Desempenho de Trichogramma pretiosum Riley e T. exiguum Pinto & Platner (Hymenoptera: Trichogrammatidae) submetidos a diferentes densidades de ovos de Plutella xylostella (Lepidoptera: Plutellidae)

Cited by 14 publications

References 6 publications

Performance of four Trichogramma species (Hymenoptera: Trichogrammatidae) as biocontrol agents of Heliothis virescens (Lepidoptera: Noctuidae) under various temperature regimes

Performance of four Trichogramma species (Hymenoptera: Trichogrammatidae) as biocontrol agents of Heliothis virescens (Lepidoptera: Noctuidae) under various temperature regimes

Transgenic Insecticidal Crops and Natural Enemies: A Detailed Review of Laboratory Studies

Parasitismo e superparasitismo de Trichogramma pretiosum Riley(Hymenoptera: Trichogrammatidae) em ovos de Sitotroga cerealella(Oliver) (Lepidoptera: Gelechiidae)

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