Fertility life table of Aphidius colemani Viereck, 1912 (Hym.: Braconidae, Aphidiinae) on Aphis gossypii Glover, 1877 (Hem.: Aphididae). / Tabela de vida de fertilidade de Aphidius colemani Viereck, 1912 (Hym.: Braconidae, Aphidiinae) em Aphis gossypii Glover, 1877 (Hemiptera: Aphididae)
AUTOR(ES)
Andrea de FÃtima Torres
DATA DE PUBLICAÇÃO
2006
RESUMO
The determination of fertility life table is important to understanding the population dynamic of an insect, and for providing strategies development for pestsâ control. The intrinsic rate of increase of a parasitoid related to their hosts play an important role in biological control programs. This work aimed to evaluate the fertility and the survival of the parasitoid Aphidius colemani Viereck on Aphis gossypii Glover as a host under fertility life table. The experiment was carried out in a climatic chamber at 22 Â 1ÂC, RH 70 Â 10% and 12h photophase. To determine the immature mortality, the development time and the sex ratio of the parasitoid, 12 mated females of the parasitoid, 24 hours old, and 240 nymphs of A. gossypii (3 days old) were used. To evaluate the longevity and fertility of A. colemani, 15 mated females, 24 hours old, were used. Nymphs of A. gossypii were offered for each parasitoid female daily, until the female died. The numbers of nymphs were in the 1st day - 300 nymphs, 2nd day - 250 nymphs, 3rd day - 200 nymphs, 4th day - 150 nymphs, 5th day - 100 nymphs and in the other days a number of 50 nymphs. A. colemani had an immature mortality of 22.1%, a development time of males and females of 12.0 and 11.8 days, respectively, and a sex ratio of 0.6. The females of A. colemani showed fecundity of 420 eggs and average longevity of 5.9 days. The net reproduction rate (Ro) and the intrinsic rate of increase (rm) were, respectively, 194.81 and 0.384. The finite rate of increase (l) was 1.48 females per day, the mean length of a generation (T) was 13.74 days and the time to duplication the population (TD) was 12.60 days. The parasitoid A. colemani had a great potential of population growth on A. gossypii as a host and could be an effective biological control agent of this aphid.
ASSUNTO(S)
biological control mortalidade de imaturos desenvolvimento parasitÃide longevity immature mortality parasitoid cucumbers pepino longevidade fecundity controle biolÃgico taxa reprodutiva aphid entomologia agricola development afÃdeo
ACESSO AO ARTIGO
http://bibtede.ufla.br/tede//tde_busca/arquivo.php?codArquivo=154Documentos Relacionados
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