Comparison between three ages of the parasitoid Cotesia flavipes in the parasitism of Diatraea saccharalis / Estratégias de parasitismo da vespa parasitóide Cotesia flavipes, Cameron, 1891 (Hymenoptera:Braconidae)

AUTOR(ES)

Marcia Terumi Uehara

DATA DE PUBLICAÇÃO

2005

RESUMO

Cotesia flavipes is an endoparasitoid wasp introduced in Brazil to biologically control the host Diatraea saccharalis, commonly known as the sugar cane drill. These insects have been reared for more than thirty years in Brazil, in massal rearing creation laboratories. In times of good female productivity in massal rearing creation laboratories, the parasitoids are used immediately after emergence. Though, in certain periods of the year, insect production presents a sex ratio towards males, so the insects are used after 24 hours in order to guarantee copulation. The objective of this work was to compare the efficiency of C. flavipes of three ages (0, 24 and 48h) in the parasitism of 5th instar D. saccharalis with a density of three hosts. Three hosts were offered to a female parasitoid so that she would deposit eggs in a short time interval with a fixed density. The study verified that C. flavipes of all three ages was capable of parasitizing the three hosts offered for oviposition and also of generating offspring from them. Though, the host which received the wasps first deposit with 0, 24 and 48h of age, had the largest number of offspring. There was a difference in the number of offspring for the third parasitized caterpillar for wasps? aged 24 and 48 h, while newly emerged (0h) wasps parasitized the host D. saccharalis without generating offspring. Although, when the means for the three ages were compared statistically, offspring sizes were equal. Sexual bias was also statistically equal in all three ages and in the three deposits. We conclude that C. flavipes aged 0, 24 and 48 h are equally efficient in the parasitism of D. saccharalis.

ASSUNTO(S)

cotesia flavipes biological control densidade. parasitóide age cotesia flavipes oviposition parasitoids density. diatraea saccharalis idade comportamento de oviposição controle biológico diatraea saccharalis

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