Comportement de mâles stériles de &lt;em&gt;Glossina tachinoides&lt;/em&gt; West. lâchés dans les conditions naturelles - environs de Fort-Lamy (Tchad). I. Transport, lâchers, rythme d'activité, action sur la population sauvage

Cuisance, Dominique; Itard, Jacques

doi:10.19182/remvt.7864

Cited by 8 publications

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“…This anomaly was not observed at the CIRDES insectary (unpublished data). The same abnormalities were also reported with G. tachinoides males which were irradiated in France and airlifted to Chad for experimental releases [ 21 ]. It is postulated that these abnormalities could be correlated with variation of the temperature and relative humidity during transport and/or might also be related to vibrations or mechanical shocks during transport: this will require further research.…”

Section: Discussionsupporting

confidence: 74%

“…In other SIT research projects, tsetse were transported as irradiated adults. Indeed, G. tachinoides adult males were reared at Maisons-Alfort and irradiated at Saclay (France), then transported by air to N’Djamena (Chad) to be release in low Logone (Cameroon) [ 21 , 22 ]. Whereas the transboundary shipment of mature irradiated pupae is applied for the first time in a tsetse eradication program with an SIT component, it is common practice for other pests such as fruit flies [ 23 - 25 ].…”

Section: Discussionmentioning

confidence: 99%

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Long distance transport of irradiated male Glossina palpalis gambiensis pupae and its impact on sterile male yield

Pagabeleguem

Seck

Sall³

et al. 2015

Parasites Vectors

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BackgroundThe application of the sterile insect technique (SIT) requires mass-production of sterile males of good biological quality. The size of the project area will in most cases determine whether it is more cost effective to produce the sterile flies locally (and invest in a mass-rearing facility) or import the sterile flies from a mass-rearing facility that is located in another country. This study aimed at assessing the effect of long distance transport of sterile male Glossina palpalis gambiensis pupae on adult male fly yield.MethodsThe male pupae were produced at the Centre International de Recherche-Développement sur l’Elevage en zone Subhumide (CIRDES), Bobo-Dioulasso, Burkina Faso, and shipped with a commercial courier service in insulated transport boxes at a temperature of ±10°C to Senegal (±36 h of transport). Upon arrival in the insectary in Dakar, the pupae were transferred to an emergence room and the flies monitored for 3–6 days.ResultsThe results showed that the used system of isothermal boxes that contained phase change material packs (S8) managed to keep the temperature at around 10°C which prevented male fly emergence during transport. The emergence rate was significantly higher for pupae from batch 2 (chilled at 4°C for one day in the source insectary before transport) than those from batch 1 (chilled at 4°C for two days in the source insectary before transport) i.e. an average (±sd) of 76.1 ± 13.2% and 72.2 ± 14.3%, respectively with a small proportion emerging during transport (0.7 ± 1.7% and 0.9 ± 2.9%, respectively). Among the emerged flies, the percentage with deformed (not fully expanded) wings was significantly higher for flies from batch 1 (12.0 ± 6.3%) than from batch 2 (10.7 ± 7.5%). The amount of sterile males available for release as a proportion of the total pupae shipped was 65.8 ± 13.3% and 61.7 ± 14.7% for batch 1 and 2 pupae, respectively.ConclusionsThe results also showed that the temperature inside the parcel must be controlled around 10°C with a maximal deviation of 3°C to maximize the male yield.Electronic supplementary materialThe online version of this article (doi:10.1186/s13071-015-0869-3) contains supplementary material, which is available to authorized users.

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Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Long distance transport of irradiated male Glossina palpalis gambiensis pupae and its impact on sterile male yield

Pagabeleguem

Seck

Sall³

et al. 2015

Parasites Vectors

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“…In the majority of previous control programmes that included a SIT component, the sterile males used for release were rather young, i.e. sterile male G. austeni were 4–7 days old when released on Unguja Island, Zanzibar [ 37 ], sterile male G. p. palpalis were 3–5 days old when released in the Lafia area of Nigeria [ 38 ], and sterile male Glossina tachinoides were 2–10 days old when released in a pilot trial in Chad [ 39 ]. Using younger males avoided losses in the rearing facility due to mortality, and was cost effective in terms of space and labour.…”

Section: Discussionmentioning

confidence: 99%

Determination of the optimal mating age of colonised Glossina brevipalpis and Glossina austeni using walk-in field cages in South Africa

2015

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Background: For the control of Glossina brevipalpis and Glossina austeni that occur in South Africa an area-wide integrated pest management (AW-IPM) program with a sterile insect technique (SIT) component has been proposed. The quality of the released sterile male tsetse flies will greatly determine the success of the SIT component of the programme. Sterile males need to be able to compete with wild males immediately after their release in the affected area. The mating competitiveness can be affected by many factors including the optimal mating age of the fly which can have an impact on the timing of the release.

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“…In fruit fly species, the shipment time is usually held under 48 h because the quality of flies drops rapidly beyond 24 h (FAO/IAEA/USDA, 2014; Chung et al, 2018). Conditions during transport may compromise the quality of insects (Pagabeleguem et al, 2015;Melicher et al, 2019), such as a decrease in emergence or an increase in wing deformities (Cuisance and Itard, 1973;Pagabeleguem et al, 2015). Chilling and hypoxia are the two main treatments used to prevent emergence during the transportation in SIT programmes (Andress et al, 2013;Diallo et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Hypoxia combined with chilling maintains the quality of irradiated Drosophila flies: a simulated shipment experiment

Enriquez

Sassù

Cáceres

et al. 2021

Bull. Entomol. Res.

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Drosophila suzukii is an invasive fruit pest in Europe and America. Females lay eggs into mature fruit that larvae consume causing important losses. Sterile insect technique (SIT) is under development to control this pest. The efficiency of this technique relies on insect quality. However, during the process from mass production to field release, several steps may compromise insect quality and therefore SIT success. Shipment of sterile insects after irradiation is a key step of SIT programmes. Generally, insects are shipped as pupae and conditions during transport need to be adapted to prevent emergence before field release, while guaranteeing insect quality. To do so, transport is usually performed under low temperature, hypoxia or a combination of both. However, the impact of multiple stressors such as irradiation followed by chilling combined with hypoxia is poorly described and has not been studied in D. suzukii. Therefore, the aim of this study was to simulate a shipment of D. suzukii pupae (irradiated or not) under different conditions (chilling combined or not with hypoxia) for various durations, and to assess consequences on emerged adults. Irradiation followed by hypoxia and/or chilling only weakly altered emergence. However, 48 h of hypoxia without chilling altered the flight ability of flies whether or not they were irradiated. Conversely, when hypoxia was combined with chilling, flight ability remained similar to that of untreated flies. The use of chilling in combination with hypoxia for 48 h could be implemented as a transportation method for SIT programme on D. suzukii.

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Comportement de mâles stériles de <em>Glossina tachinoides</em> West. lâchés dans les conditions naturelles - environs de Fort-Lamy (Tchad). I. Transport, lâchers, rythme d'activité, action sur la population sauvage

Cited by 8 publications

References 0 publications

Long distance transport of irradiated male Glossina palpalis gambiensis pupae and its impact on sterile male yield

Long distance transport of irradiated male Glossina palpalis gambiensis pupae and its impact on sterile male yield

Determination of the optimal mating age of colonised Glossina brevipalpis and Glossina austeni using walk-in field cages in South Africa

Hypoxia combined with chilling maintains the quality of irradiated Drosophila flies: a simulated shipment experiment

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