Neotropical Entomology (2001) 30, 277-282

Dirceu Pratissoli and José R.P. Parra (2001)
Seleção de Linhagens de Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) para o Controle das Traças Tuta absoluta (Meyrick) e Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae)
[Selection of strains of Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) to control the tomato leafminer moths Tuta absoluta (Meyrick) and Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae)]
Neotropical Entomology 30 (2), 277-282
Abstract: The biological aspects and the parasitism of six strains of Trichogramma pretiosum Riley reared on eggs of tomato moths Tuta absoluta (Meyrick) and Phthorimaea operculella (Zeller) were studied in order to select those with best biological features and more aggressive to control such pests. Life cycle, viability, sexual ratio and parasitism percentage were similar among the six strains studied regarding the parasitism of T. absoluta eggs. In P. operculella eggs, strains L1, L4 and L6 were more aggressive. Based on the cluster analysis, strains L1, L2, L4 and L5 had similar behavior when reared on T. absoluta eggs. For P. operculella, similarities were observed among strains L1, L3, L4 and L6. Considering the desirable biological characteristics, that is, higher parasitism, shorter life cycle, higher viability and predominance of females, strains L1 and L4 are more suitable for tomato moths.

Foram estudados aspectos biológicos e o parasitismo de seis linhagens de Trichogramma pretiosum Riley, criadas em ovos das traças Tuta absoluta (Meyrick) e Phthorimaea operculella (Zeller), com o objetivo de selecionar as linhagens com melhores características biológicas e mais agressivas no controle dessas traças. O ciclo de desenvolvimento, a viabilidade, a razão sexual e a porcentagem de parasitismo foram semelhantes entre as seis linhagens estudadas com relação ao parasitismo de ovos de T. absoluta. Em ovos de P. operculella, as linhagens L1, L4 e L6 foram as mais agressivas. Baseando-se na análise de agrupamento (cluster analysis), as linhagens L1, L2, L4 e L5, quando criadas em ovos de T. absoluta, mostraram comportamento semelhante. Para P. operculella, foram observadas semelhanças entre as linhagens L1, L3, L4 e L6. Considerando-se as características biológicas desejáveis, ou seja, maior parasitismo, encurtamento do ciclo, maior viabilidade e predominância de fêmeas, são mais indicadas, para ambas as traças, as linhagens L1 e L4.
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(original language: Portuguese)
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Database assignments for author(s): Dirceu Pratissoli

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
evaluation - screening - selection

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phthorimaea operculella
	Phthorimaea absoluta
Trichogramma pretiosum (parasitoid)	Phthorimaea operculella
Trichogramma pretiosum (parasitoid)	Phthorimaea absoluta