Emergence, longevity and fecundity of Trissolcus basalis and Telenomus podisi after cold storage in the pupal stage

Luís Amilton Foerster,Letícia Cunha Ferreira de Castro,Augusta Karkow Doetzer

doi:10.1590/s0100-204x2004000900002

Luís Amilton Foerster, Letícia Cunha Ferreira de Castro + Show 1 more

Open Access

https://doi.org/10.1590/s0100-204x2004000900002

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Abstract

Pupae of Trissolcus basalis (Wollaston) and Telenomus podisi Ashmead (Hymenoptera: Scelionidae) were stored at 12ºC and 15ºC for 120-210 days, after different periods of parasitism at 18ºC in order to evaluate adult emergence, longevity and ovipositional capacity. There was no emergence of adults at 12ºC. The rate of emergence of parasitoids transferred to 15ºC at the beginning of the pupal stage was 1.5% and 26.3%, for T. basalis and T. podisi respectively, whereas those parasitoids transferred one day before the expected date of emergence at 18ºC showed 86.4% of emergence for T. basalis and 59.9% for T. podisi. Mean adult longevity was also significantly lower when pupae were transferred to 15ºC at the beginning of the pupal stage. Females emerged after storage and maintained for 120 to 210 days at 15ºC parasitized host eggs after transference to 25ºC; however, fecundity of T. podisi was reduced in about 80% after cold storage.

Highlights

Several egg parasitoids of subtropical and temperate regions overwinter in a hibernation state (Boivin, 1994), which can determinate their population dynamics, geographic distribution and potential as biological control agents (Mansingh, 1971; Boivin, 1994)
Most research on cold storage of egg parasitoids has been conducted on Trichogramma species (Stinner et al, 1974; Curl & Burbutis, 1977; Jalali & Singh, 1992; Laing & Corrigan, 1995), Ooencyrtus ennomus Yoshimoto (Encyrtidae) (Anderson & Kaya, 1974, 1975) and Encarsia formosa Gahan (Aphelinidae) (Lacey et al, 1999)
The objective of this work was to determine the effect of pupae storage at 12oC and 15oC after different periods of parasitism on adult emergence, longevity and fecundity of Trissolcus basalis and Telenomus podisi

Summary

Introduction

Several egg parasitoids of subtropical and temperate regions overwinter in a hibernation state (Boivin, 1994), which can determinate their population dynamics, geographic distribution and potential as biological control agents (Mansingh, 1971; Boivin, 1994). The developmental stage susceptible to hibernation differs between species; most egg parasitoids hibernate as larvae or pupae within the host egg (Boivin, 1994). Most research on cold storage of egg parasitoids has been conducted on Trichogramma species (Stinner et al, 1974; Curl & Burbutis, 1977; Jalali & Singh, 1992; Laing & Corrigan, 1995), Ooencyrtus ennomus Yoshimoto (Encyrtidae) (Anderson & Kaya, 1974, 1975) and Encarsia formosa Gahan (Aphelinidae) (Lacey et al, 1999). The storage of Telenomus remus Nixon in the pupal stage at 10oC for seven days did not influence parasitoid survival (Gautam, 1986).

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