Improvement in the cold storage of Aphidius ervi (Hymenoptera: Aphidiinae)

Frère, Isabelle; Balthazar, Carole; Sabri, Ahmed; Hance, Thierry

doi:10.14712/23361964.2015.63

Cited by 7 publications

(6 citation statements)

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“…Similar results were obtained by Frère et al (2011). Whatever the temperature, the emergence rate after two weeks of exposure to low temperatures remains high and not significantly different from the control.…”

Section: Discussionsupporting

confidence: 86%

Fitness consequences of low temperature storage of Aphidius ervi

et al. 2013

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International audienceIn biological control programs, storage at low temperatures is used to produce large number of individuals before inundative releases. However, an exposure to low temperatures may affect the survival of exposed individuals and some life history traits such as the daily fecundity or the longevity of the survivors. This impact on life history traits is important because they will determine the growth potential of the population. To estimate the costs of different treatments of low temperature exposure, we analyzed the main instantaneous demographic parameters of the parental generation of Aphidius ervi Haliday (Hymenoptera: Braconidae: Aphidiinae) when exposed to three storage temperatures (7, 4 and 0 C), combined with two storage durations (one and two weeks) and two thermal regimes (constant and fluctuating), which represents a total of 12 treatments and a control. The average cohort generation time (Tc) decreased significantly after exposure to low temperature, particularly in fluctuating treatments. This means that development continues during storage. Cumulative fecundity and the net reproductive rate (R0) decreased significantly for most of the storage treatments. This decrease was most pronounced in the constant temperature treatments. Females under fluctuating thermal regime produced a higher cumulative fecundity than those exposed to constant temperatures. Surprisingly, an exposure to 0 C over one week did not affect emergence rate and fecundity whereas all other treatments did. Storage at low temperatures may affect the efficiency of inundative releases, with the exception of storage for one week at 0 C. Moreover, cumulative fecundity and net reproductive rate (R0) represent a more immediate prediction of the increase of the population after low temperature exposure than the intrinsic rate of increase (rm), and reflect the qualities required in an inundative release context

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Section: Discussionsupporting

confidence: 86%

Fitness consequences of low temperature storage of Aphidius ervi

et al. 2013

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“…barley yellow dwarf virus) (Dixon, 1973, 1985; Carter et al , 1982; Llewellyn et al , 2003). Information on their distribution in agricultural landscapes is lacking (Gilabert et al , 2009) and many aspects of their biological control remain hypothetical (Vialatte et al , 2006; Frère et al , 2011).…”

Section: Introductionmentioning

confidence: 99%

Does the presence of grassy strips and landscape grain affect the spatial distribution of aphids and their carabid predators?

Hassan¹,

Georgelin²,

Delattre³

et al. 2012

Agri and Forest Entomology

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International audience1 We investigated, over the course of 2 years, the spatial distribution and abundance of two species of aphid, Metopolophium dirhodum and Sitobion avenae, and predatory species of carabid. This was undertaken in 24 wheat fields in 'coarse-grain' and 'finegrain' landscapes in western France. A greater percentage of the latter landscape was covered by hedgerows and grassland and the total area covered by fields and the average size of the fields were smaller. 2 The effects on aphid abundance of the distance from field margins, the presence of grassy strips and carabid abundance were determined in both landscapes. 3 Both aphid species were more abundant in the 'fine-grain' landscape, which may have been a result of the higher density of semi-natural elements. In both types of landscape, the total numbers of aphids were negatively correlated with the distance from the field margin. This may have been because aphids were dispersing from overwintering sites in field margins. The abundance of M. dirhodum was strongly negatively correlated with the presence of grassy strips in the 'coarsegrain' landscape, although there were no such significant correlations for either of the aphid species in the 'fine-grain' landscape. 4 Aphid and carabid abundances were negatively correlated in the 'fine-grain' and positively in 'coarse-grain' landscape. 5 The results obtained in the present study emphasize the importance of semi-natural areas in agricultural landscapes in shaping the spatial distribution of aphids and carabid beetles, their natural enemies, at different spatial scales

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“…Adult emergence is a crucial parameter for the successful storage of any natural enemy (Colinet & Boivin, 2011). As reported in previous studies (Archer et al, 1973;Frere et al, 2011;Ismail et al, 2014;Mahi et al, 2014), increased duration of cold storage reduces adult emergence. For instance, Lins et al (2013) reported that adult emergence of P. volucre in the control treatment was 93.1% whereas it was 63.5% after storage at 5°C for 20 days.…”

Section: Discussionmentioning

confidence: 74%

“…For each species, it is critical to select the most tolerant life stage for cold storage (Archer et al, 1973;Hofsvang & Hagvar, 1977;Lins et al, 2013;Ismail et al, 2014;Kidane et al, 2015;Benelli et al, 2018). The 'mummy stage' (when the parasitoid is inside the mummified host aphid) of Aphidiinae parasitoids is considered to be the most suitable stage for storage (Levie et al, 2005;Colinet & Hance, 2010;Frere et al, 2011;Ismail et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Studies on cold storage of biocontrol agents started about 90 years ago, particularly on Aphidiinae parasitoids (Colinet et al, 2006;Colinet & Hance, 2010;Frere et al, 2011;Silva et al, 2013;Mahi et al, 2014). Storage at low temperatures has been optimized for several species of Aphidiinae parasitoids, including Lysiphlebus testaceipes (Cresson) (Archer et al, 1973), Aphidius colemani Viereck, Ephedrus cerasicola Starỳ (Hofsvang & Hagvar, 1977), Aphidius ervi (Haliday) (Ismail et al, 2010), Praon volucre (Haliday) (Lins et al, 2013), and Diaeretiella rapae (McIntosh) (Silva et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Effects of cold storage on life‐history traits ofAphidius matricariae

Rezaei

Talebi

Fathipour

et al. 2020

Entomologia Exp Applicata

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Aphidius matricariae Haliday (Hymenoptera: Braconidae) is a polyphagous solitary endoparasitoid, attacking more than 40 species of aphids. This parasitoid is an important commercial product of many companies that produce biological control agents. Storage at low temperature increases the shelf life of many biocontrol agents, allowing companies to provide a steady and sufficient supply of insects for biocontrol programs. In the current study, the effects of cold storage of 1‐day‐old host mummies with A. matricariae for various time periods (5, 10, 15, 20, and 30 days) at 5 °C on the parasitoid’s key life‐history traits were investigated. Parameters assessed after storage included adult emergence rate, offspring sex ratio, adult longevity, oviposition period, fecundity, and life‐table parameters (R0, r, λ, T, and DT). Our results showed that the mummies of A. matricariae could be stored at 5 °C for 5 days without loss of quality and for 10–15 days with minimal reduction in quality (e.g., some reduction in adult longevity and R0). If parasitoids were stored for >15 days, quality was more strongly affected. In conclusion, A. matricariae pupae could be stored at 5 °C for up to 15 days without significant negative post‐storage effects on fitness of the parasitoid. These results could be used to improve the planning of mass rearing and mass release of A. matricariae in augmentative biological control programs.

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Improvement in the cold storage of Aphidius ervi (Hymenoptera: Aphidiinae)

Cited by 7 publications

References 1 publication

Fitness consequences of low temperature storage of Aphidius ervi

Fitness consequences of low temperature storage of Aphidius ervi

Does the presence of grassy strips and landscape grain affect the spatial distribution of aphids and their carabid predators?

Effects of cold storage on life‐history traits ofAphidius matricariae

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