The Effect of Host Density and Viability on Superparasitism Behavior of &amp;lt;i&amp;gt;Trichogramma cacoeciae&amp;lt;/i&amp;gt; and &amp;lt;i&amp;gt;T. principium&amp;lt;/i&amp;gt; Females

Harba, Muhanad

doi:10.11648/j.aff.20180701.13

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…A series of factors (e.g., host exposure time, host density, female mating status) affect self‐superparasitism in wasps (Darrouzet et al, 2003; van Nieuwenhove et al, 2012; Kraft & van Nouhuys, 2013; Nalini, 2015; Harba & Idris, 2018). Our study showed that female age did not affect self‐superparasitism, which agrees with Michaud & Mackauer (1995), who found that older virgin females did not have more self‐superparasitism than younger virgin females.…”

Section: Discussionmentioning

confidence: 99%

Effect of maternal age on primary and secondary sex ratios in the ectoparasitoid wasp Pachycrepoideus vindemmiae

Gong

Chen

et al. 2022

Entomologia Exp Applicata

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Sex allocation is defined as the allocation of resources to produce male and female offspring during reproduction, and it is an important topic in evolutionary biology. As organisms with special haplo-diploid sex determination, parasitoid wasps are particularly suited for the study of sex allocation. However, most studies focused on the secondary sex ratio (i.e., the eclosion sex ratio) because the oviposition ratio (the primary sex ratio) is difficult to study, especially in parasitoid species. The primary sex ratio may differ from the secondary sex ratio due to larval mortality and self-superparasitism.The present study used microsatellites to explore the effects of female age on the primary and secondary sex ratio (male proportion) of the solitary ectoparasitoid Pachycrepoideus vindemmiae (Rondani) (Hymenoptera: Pteromalidae). The primary sex ratio showed a significant decreasing trend as the oviposition days increased, and the secondary sex ratio significantly increased. Self-superparasitism, i.e., laying more than one egg in a host, was the cause of the variation in the secondary sex ratio in P. vindemmiae. When females practiced self-superparasitism, they tended to lay female eggs. The application of microsatellites helped explore and improve the understanding of the primary sex ratio and self-superparasitism in this ectoparasitoid species.

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Section: Discussionmentioning

confidence: 99%

Effect of maternal age on primary and secondary sex ratios in the ectoparasitoid wasp Pachycrepoideus vindemmiae

Gong

Chen

et al. 2022

Entomologia Exp Applicata

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“…Moreover, insects are becoming resistant to insecticides over time and help to produce superbugs [19]. Hence, nding control methods for P. operculella becomes increasingly important to continue in growth and development of the potato industry [36,17].…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Olive Stones and Corncobs Crystalline Silica Nanoparticles (SiO2, NPs) Treatments on Potato Tuber Moths (Phthorimaea Operculella)

Idris

Naddaf

Harmalani

et al. 2023

Silicon

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Morphological and microstructural properties of silica (SiO 2 ) are essential factors that need to be considered during the experimental applications. In this report, SiO 2 nanoparticles (NPs) have been prepared at different concentrations from SiO 2 powder derived from olive stones and corncobs by an alkali leaching extraction method. Thermal treatment has been used to modify the morphological and microstructural properties of the extracted SiO 2 . X-ray diffraction (XRD) shows that the extracted amorphous SiO 2 has been transformed into a crystalline phase after the thermal treatment. Nitrogen adsorption-desorption measurements revealed signi cant reduction in both the speci c surface area (SABET) and the total pores volume (Vtotal) of the derived SiO 2 samples after the thermal treatment. The acquired thermal treatment properties of SiO 2 found to have high impacts on the in uence of the SiO 2 NPs on the survival and development of larvae and pupae of P. opercullela. SiO 2 NPs prepared from the crystalline silica samples exhibited less e ciency on suppressing potato tuber moth comparing to SiO 2 NPs of the amorphous silica powders. Varied effects on biological parameters including larvae mortality, pupae weight, larval and pupal development time, fecundity and fertility are also linked to the SiO 2 NPs source type and showed concentration depending manner effects. SiO 2 NPs are conditionally effective as an alternative pesticide against P. opercullela, based on their sources, mesoporous structures and concentrations.

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“…Trichogramma species (Hymenoptera: Trichogrammatidae) are important biological control agents of agricultural pests (Woelke et al, 2017) and have more than 400 host species, especially Lepidoptera (Harba & Idris, 2018). The success of egg parasitoids in the field is closely associated with their search capacity (Siqueira et al, 2011), which is mainly mediated by chemical stimuli from hosts (Strand & Vinson, 1982; Vinson, 1998).…”

Section: Introductionmentioning

confidence: 99%

Influence of semiochemicals present in the scales of Spodoptera frugiperda on chemotactic behavior of Trichogramma pretiosum

Vargas

Sant’Ana

Blassioli‐Moraes

et al. 2021

Entomologia Exp Applicata

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Trichogramma species (Hymenoptera: Trichogrammatidae) are known to use the host's sex pheromone as a kairomone in foraging strategies. Spodoptera frugiperda Smith (Lepidoptera: Noctuidae) deposit scales on eggs during oviposition, which may be a mechanical barrier or facilitate the action of parasitoids due to the presence of semiochemicals. This study identified the compounds in S. frugiperda scales and evaluated the chemotactic responses of Trichogramma pretiosum Riley to volatiles in host eggs and scales, as well as to synthetic equivalents of substances identified therein. Bioassays were performed with scales extracted from the wings and abdomen of females under three conditions: virgin, mated, or mated and oviposited. The parasitoids were tested in a two-choice olfactometer comparing scales, eggs, and synthetic compounds. The extracts were analyzed by gas chromatography and mass spectrometry (GC-MS) and 20 compounds were identified, among them two acetate components of the sex pheromone of S. frugiperda (Z9-14:OAC and Z11-16:OAC). Trichogramma pretiosum females did not differentiate between scales from wings and abdomen. They were more attracted to scales from virgin and mated S. frugiperda females, and these treatments did not trigger different chemotactic responses compared with eggs. The parasitoid was significantly attracted to Z9-14:OAC and Z11-16:OAC. We conclude that T. pretiosum use chemical clues in the scales to search for S. frugiperda eggs.

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The Effect of Host Density and Viability on Superparasitism Behavior of <i>Trichogramma cacoeciae</i> and <i>T. principium</i> Females

Cited by 6 publications

References 6 publications

Effect of maternal age on primary and secondary sex ratios in the ectoparasitoid wasp Pachycrepoideus vindemmiae

Effect of maternal age on primary and secondary sex ratios in the ectoparasitoid wasp Pachycrepoideus vindemmiae

Efficacy of Olive Stones and Corncobs Crystalline Silica Nanoparticles (SiO2, NPs) Treatments on Potato Tuber Moths (Phthorimaea Operculella)

Influence of semiochemicals present in the scales of Spodoptera frugiperda on chemotactic behavior of Trichogramma pretiosum

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