The density of females of Palmistichus elaeisis Delvare and LaSalle (Hymenoptera: Eulophidae) affects their reproductive performance on pupae of Bombyx mori L. (Lepidoptera: Bombycidae)

Anais da Academia Brasileira de Ciências

Fabricio F. Pereira²  José C. Zanuncio¹  José E. Serrão¹  Teresinha V. Zanuncio¹  Dirceu Pratissoli¹  Patrik L. Pastori¹ 

[1] ,Universidade Federal da Grande Dourados Faculdade de Ciências Biológicas e Ambientais Dourados MS ,Brasil

关键词: alternative host;    biological control;    mass rearing;    parasitism rate;    parasitoids;    hospedeiro alternativo;    controle biológico;    criação massal;    taxas de parasitismo;    parasitóides;   

DOI  :  10.1590/S0001-37652010000200008

来源: SciELO

【 摘 要 】

Palmistichus elaeisis Delvare and LaSalle (Hymenoptera: Eulophidae) is a gregarious and polyphagous parasitoid mainly of Lepidoptera pupae. The objective of this paper as to study the developent of parasitoid on Bombyx mori L. (Lepidoptera: Bombycidae) pupae exposed to one, nine, 18, 27, 36, 45 or 54 female P. elaeisis, respectively. The females of the parasitoid remained in contact with pupae for 24 hours in glass tubes (14.0 x 2.2 cm), packed in a climatic chamber regulated at 25 ± 2°C, 70 ± 10% relative humidity and photo phase of 12 hours. With the exception of density 1:1 (72.72%), in other densities parasitism was 100%. Adults of P. elaeisis did not emerge from pupae at densities of 1:1 and 9:1, but 100.0% of parasitoid emergence was observed at the density of 45:1 and 54.54% at 54:1. The duration of the life cycle of this parasitoid ranged from 20 to 28 days. P. elaeisis produced 49 to 589 descendants per pupa of B. mori. The sex ratio of P. elaeisis ranged from 0.93 ± 0.01 to 0.97 ± 0.01 without differences with 18, 27, 36, 45 and 54 females/host. This parasitoid should be reared with the density of 45 females per pupa of B. mori.

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