A field cage study of the optimal age for release of radio‐sterilized Aedes albopictus mosquitoes in a sterile insect technique program

2020 ◽  
Vol 168 (2) ◽  
pp. 137-147 ◽  
Author(s):  
Diana Pillay Iyaloo ◽  
Clelia Oliva ◽  
Sunita Facknath ◽  
Ambicadutt Bheecarry
Keyword(s):  
Aedes Albopictus ◽  
Sterile Insect Technique ◽  
Field Cage ◽  
Sterile Insect Technique Program

scholarly journals Sexual Competitiveness and Induced Egg Sterility by Aedes aegypti and Aedes albopictus Gamma-Irradiated Males: A Laboratory and Field Study in Mexico

Insects ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 145
Author(s):  
J. Guillermo Bond ◽  
Santiago Aguirre-Ibáñez ◽  
Adriana R. Osorio ◽  
Carlos F. Marina ◽  
Yeudiel Gómez-Simuta ◽  
...  
Keyword(s):  
Public Health ◽  
Aedes Albopictus ◽  
Sterile Insect Technique ◽  
Irradiation Dose ◽  
Mosquito Vectors ◽  
Field Cage ◽  
Egg Hatching ◽  
Public Health Threat ◽  
Medical Importance ◽  
Gamma Irradiated

The sterile insect technique may prove useful for the suppression of mosquito vectors of medical importance in regions where arboviruses pose a serious public health threat. In the present study, we examined the effects of sterilizing irradiation doses across different ratios of fertile:irradiated males on the mating competitiveness of Ae. aegypti and Ae. albopictus under laboratory and field-cage conditions. For both species, the percentage of females inseminated and the number of eggs laid over two gonotrophic cycles varied significantly in mating treatments involving 1:1, 1:5, and 1:10 fertile:irradiated males compared to controls of entirely fertile or entirely irradiated males but was not generally affected by the irradiation dose. Egg hatching was negatively affected in females exposed to increasing proportions of irradiated males in both laboratory and field cages. Male competitiveness (Fried’s index) values varied from 0.19 to 0.58 in the laboratory and were between 0.09 and 1.0 in field cages, depending on th species. Competitiveness values were negatively affected by th eirradiation dose in both species under field-cage conditions, whereas in the laboratory, Ae. albopictus was sensitive to the dose but Ae. aegypti was not. In general, male competitiveness was similar across all mating regimes. Most importantly, induced egg sterility was positively correlated with the proportion of irradiated males present in the mating treatments, reaching a maximum of 88% under field-cage conditions for both Ae. aegypti and Ae. albopictus males treated with 50 and 40 Gy irradiation, respectively. These results indicate that sterile males produced at our facility are suitable and competitive enough for field pilot SIT projects and provide guidance to decide the optimal sterile:fertile ratios.

scholarly journals Towards a sterile insect technique field release of Anopheles arabiensis mosquitoes in Sudan: Irradiation, transportation, and field cage experimentation

2008 ◽  
Vol 7 (1) ◽  
Author(s):  
Michelle EH Helinski ◽  
Mo'awia M Hassan ◽  
Waleed M El-Motasim ◽  
Colin A Malcolm ◽  
Bart GJ Knols ◽  
...  
Keyword(s):  
Sterile Insect Technique ◽  
Anopheles Arabiensis ◽  
Field Cage ◽  
Field Release

scholarly journals Oviposition site attraction of Aedes albopictus to sites with conspecific and heterospecific larvae during an ongoing invasion in Medellín, Colombia

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Talya Shragai ◽  
Laura Harrington ◽  
Catalina Alfonso-Parra ◽  
Frank Avila
Keyword(s):  
Open Field ◽  
Aedes Albopictus ◽  
Competitive Exclusion ◽  
Oviposition Preference ◽  
Ecological Niches ◽  
Low Density ◽  
Larval Competition ◽  
Field Cage ◽  
Main Hypothesis ◽  
Oviposition Sites

Abstract Background Aedes aegypti and Aedes albopictus are two globally invasive vectors with similar ecological niches. Encounters between them can result in either competitive exclusion or stable co-existence, but it is unclear what drives these variable outcomes. Larval competition in favor of Ae. albopictus is a main hypothesis for the competitive exclusion of Ae. aegypti observed in some regions. However, the role of oviposition preference in determining the degree of competitive larval interactions in the field is not well understood. In this study, we used a combination of mark-release-recapture methods with ovitraps in the open-field and a semi-field cage to test whether gravid Ae. albopictus seek oviposition sites in response to the presence, species, and density of either conspecific or heterospecific Ae. aegypti larvae in the aquatic habitat. We conducted our study in Medellín, Colombia, where Ae. aegypti is a long-term resident and Ae. albopictus is a recent invader. Results In the open-field and semi-field cage experiments, gravid Ae. albopictus showed strong preference for ovitraps with larvae over those without. They consistently preferred ovitraps with higher density of conspecific (Ae. albopictus) larvae and low density of heterospecific (Ae. aegypti) larvae over traps with no larvae or high density of heterospecific (Ae. aegypti) larvae. In the semi-field cage experiment, traps with low density of Ae. albopictus were not preferred more or less than any other trap, but in the open-field experiment they were preferred over traps without larvae. Conclusions We demonstrate, through open-field and semi-field cage experiments, that Ae. albopictus are more attracted to oviposition sites with larvae and that the combination of species and density of larvae influence attraction. This demonstrated preference could increase interspecific larval competition as Ae. albopictus actively seek containers with conspecific and heterospecific larvae. Any resulting competition with Ae. aegypti may favor one species over the other and alter the distribution or abundance of both. Because these species vary in vectorial capacity and insecticide resistance, effects of interspecific competition could ultimately impact arbovirus transmission rates and the success of vector control efforts.

Mathematical studies on the sterile insect technique for the Chikungunya disease and Aedes albopictus

2011 ◽  
Vol 65 (5) ◽  
pp. 809-854 ◽  
Author(s):  
Y. Dumont ◽  
J. M. Tchuenche
Keyword(s):  
Aedes Albopictus ◽  
Sterile Insect Technique

Comparison between pupal and adult X-ray radiation, designed for the sterile insect technique for Aedes albopictus control

Acta Tropica ◽  
2019 ◽  
Vol 199 ◽  
pp. 105110 ◽  
Author(s):  
Wenting Du ◽  
Chunming Hu ◽  
Chaoju Yu ◽  
Jianfei Tong ◽  
Jie Qiu ◽  
...  
Keyword(s):  
Aedes Albopictus ◽  
Sterile Insect Technique ◽  
X Ray

scholarly journals The Sterile Insect Technique for Controlling Populations of Aedes albopictus (Diptera: Culicidae) on Reunion Island: Mating Vigour of Sterilized Males

PLoS ONE ◽  
2012 ◽  
Vol 7 (11) ◽  
pp. e49414 ◽  
Author(s):  
Clelia F. Oliva ◽  
Maxime Jacquet ◽  
Jeremie Gilles ◽  
Guy Lemperiere ◽  
Pierre-Olivier Maquart ◽  
...  
Keyword(s):  
Aedes Albopictus ◽  
Sterile Insect Technique ◽  
Reunion Island ◽  
Réunion Island

Pre- and Post-Copulatory Competitiveness of the Genetic Sexing Strain Tapachula-7 of Anastrepha ludens (Diptera: Tephritidae)

2020 ◽  
Vol 113 (5) ◽  
pp. 2163-2170
Author(s):  
Yair Contreras-Navarro ◽  
Diana Pérez-Staples ◽  
Dina Orozco-Dávila ◽  
Francisco Díaz-Fleischer
Keyword(s):  
Sterile Insect Technique ◽  
Copulatory Behavior ◽  
Mass Rearing ◽  
Economic Importance ◽  
Anastrepha Ludens ◽  
Sexual Performance ◽  
Field Cage ◽  
Wild Female ◽  
Genetic Sexing ◽  
Genetic Sexing Strain

Abstract Anastrepha ludens (Loew) (Diptera: Tephritidae) is an endemic pest of Mexico, attacking several fruits of economic importance. The Sterile Insect Technique (SIT), consisting of mass-rearing, irradiation and release of adults, is used to control this pest in affected areas. Currently, a genetic sexing strain (Tapachula 7, Tap-7) consisting only of A. ludens males is being released, yet we lack information on its sexual performance at the early ages when they are released and on its post copulatory behavior in terms of sperm transfer and mating inhibition. Here, sexual competitiveness at young ages and ability to inhibit female re-mating was compared between sterile Tap-7, Standard Bisexual (SB), or wild males both in laboratory and field cage conditions. Sperm stored by females mating with wild, Tap-7, or SB strain males was also compared. Six-day-old sterile Tap-7 males had low mating rates, however, by 7 d of age 80% of males had mated. Tap-7 males were just as likely as wild males to inhibit wild female re-mating. In field cages, sterile Tap-7 males mated faster than wild and sterile males from the SB strain and had comparable mating success to wild males. Females mated to sterile Tap-7 males stored more sperm than those mated to sterile SB males. Females mated to wild males stored more sperm than females mated to any other type of male. Mass-rearing had a greater effect on decreasing sperm stored by females than irradiation. We recommend continuing the release of the GSS strain of A. ludens.

scholarly journals Optimization of irradiation dose to Aedes aegypti and Ae. albopictus in a sterile insect technique program

PLoS ONE ◽  
2019 ◽  
Vol 14 (2) ◽  
pp. e0212520 ◽  
Author(s):  
J. Guillermo Bond ◽  
Adriana R. Osorio ◽  
Nancy Avila ◽  
Yeudiel Gómez-Simuta ◽  
Carlos F. Marina ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Sterile Insect Technique ◽  
Irradiation Dose ◽  
Sterile Insect Technique Program

scholarly journals Use of mechanical and behavioural methods to eliminate female Aedes aegypti and Aedes albopictus for sterile insect technique and incompatible insect technique applications

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Nayana Gunathilaka ◽  
Tharaka Ranathunge ◽  
Lahiru Udayanga ◽  
Asha Wijegunawardena ◽  
Jeremie Roger Lionel Gilles ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Aedes Albopictus ◽  
Sterile Insect Technique ◽  
Incompatible Insect Technique
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