Abstract
The objective of this work was to evaluate the influence of the embryonic development of eggs from the P. xylostella host on Trichogramma exiguum females of different ages. Fifty females – either just-emerged or 24, 48, 72 and 96 hours after emergence of this parasitoid were divided into five groups. Each female was offered a recipient with 30 P. xylostella eggs, which were 1-, 2- and 3-days-old. The greatest rates of parasitism were observed on eggs with 3 days of embryonic development, with exception of those 72-hours-old. Viability was not influenced by parasitoid age or host embryonic stage. Sex ratio was similar in all three embryonic host stages for T. exiguum females that were 24-, 48- and 72-hours-old. While evaluating parasitoid progeny obtained from eggs with 3, 2 and 1 days of embryonic development, it was verified that the highest values of longevity were obtained when the females used were just-emerged, or 48- and 72-hours-old, respectively. These results indicate the importance of the age of the parasitoid, as well as the host embryonic development period, in order to maintain quality of T. exiguum at laboratory conditions, in mass culture, as well as in field releases for biological pest control.
Highlights
Parasitóides de ovos do gênero Trichogramma têm sido amplamente estudados e utilizados, podendo ser considerado o agente de controle biológico mais utilizado no controle de pragas no mundo (Van Lenteren e Bueno, 2003)
These results indicate the importance of the age of the parasitoid, as well as the host embryonic development period, in order to maintain quality of T. exiguum at laboratory conditions, in mass culture, as well as in field releases for biological pest control
Os resultados indicam a importância da idade do parasitóide, bem como o período de desenvolvimento embrionário do hospedeiro para manter a qualidade de T. exiguum em laboratório, em uma criação massal, e também nas liberações de campo para o controle biológico de pragas
Summary
Parasitóides de ovos do gênero Trichogramma têm sido amplamente estudados e utilizados, podendo ser considerado o agente de controle biológico mais utilizado no controle de pragas no mundo (Van Lenteren e Bueno, 2003). A porcentagem de parasitismo de T. exiguum foi maior em ovos de P. xylostella com três dias de desenvolvimento embrionário, independente da idade da fêmea. Quando os ovos de P. xylostella apresentavam três dias de desenvolvimento embrionário, a taxa de parasitismo foi maior com fêmeas de T. exiguum de até 48 horas de idade.
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