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17 results for “Sterile Insect Technique”
Quality control traceability during the packing and release process of Ceratitis capitata for Sterile Insect Technique
<p><strong>Abstract</strong></p> <p>In programs applying the Sterile Insect Technique (SIT), the quality of insects deployed in the field determines the success in preventing, suppressing, containing, or eradicating the pest population. In the fruit fly emergence and release facility (ERF) of the Moscamed Program in Mexico, irradiated pupae of <em>Ceratitis capitata</em> are packed in Mexico-type towers, and key adult quality parameters, such as emergence, fliers, and survival, are determined throughout the packing, handling and release process. However, different methodologies are used to estimate the percentage of fliers in the different stages of the process, raising doubts of whether observed differences are due to the effect of each stage or to the methodology used. With this in mind, we developed an alternative called “Adult Flier device” (= AF-device) to evaluate the adult flier parameter following a critical evaluation path of five steps: 1) upon arrival at ERF, 2) post-packing, 3) post-holding, 4) post-chilling, and 5) post-release, where adult fliers and survival under stress were evaluated. We also compared the current methodologies for the estimation of "absolute fliers" available in different operating manuals. Our results suggest that the AF-device allows reliable traceability of sterile insect quality parameters throughout the packing and release process, since no significant differences were observed with the control treatments. In the chilling stage, the five methodologies tested were equivalent, but the AF-device was less time-consuming and required less manpower and biological material than the other methodological options. Our results demonstrate that the use of the AF-device can be a feasible, versatile, innovative, and efficient alternative to evaluate quality control parameters throughout the process of packing and releasing sterile insects, providing reliable results in a timely manner with less hand labor using minimal biological material.</p>
Fig. 5 in Methods to separate Lobesia botrana (Lepidoptera: Tortricidae) males from females for the implementation of sterile insect-inherited sterility technique control tactics
Fig. 5. The percentages of male and female Lobesia botrana adults that emerged from the pupal stage on each consecutive d afer the onset of adult emergence.
Fig. 6 in Methods to separate Lobesia botrana (Lepidoptera: Tortricidae) males from females for the implementation of sterile insect-inherited sterility technique control tactics
Fig. 6. Distribution of Lobesia botrana male and female pupae based on the overall lengths of the pupae.
Fig. 3. R, G and B in Methods to separate Lobesia botrana (Lepidoptera: Tortricidae) males from females for the implementation of sterile insect-inherited sterility technique control tactics
Fig. 3. R, G and B color values of male and female Lobesia botrana larvae during the wandering phase. A. Average R, G and B color values of wandering male and female larvae, and B. Percentages of wandering red, green and blue larvae in relation to the R, G and B values as a proportion of total male and female larvae. * P = 0.001, Tukey α = 0.05.
Fig. 1 in Methods to separate Lobesia botrana (Lepidoptera: Tortricidae) males from females for the implementation of sterile insect-inherited sterility technique control tactics
Fig. 1. Lobesia botrana pupae indicating the number of abdominal segments in (A) male (4 segments), and (B) female pupae (3 segments) as measured from the abdomen tip to the wing's point, and (C) distance between the head and the abdomen tip as a measurement of pupal length.
Fig. 4 in Methods to separate Lobesia botrana (Lepidoptera: Tortricidae) males from females for the implementation of sterile insect-inherited sterility technique control tactics
Fig. 4. The percentages of wandering Lobesia botrana larvae that departed from their food on each consecutive day of the wandering phase and that sub- sequently developed into either adult males or adult females.
Fig. 3 in Factors and Variables that Affect Quality of Lepidopterans Used in SIT Programs General biology of Eldana saccharina (Lepidoptera: Pyralidae): A target for the sterile insect technique
Fig. 3. Frequency distribution of multiple matings of Eldana saccharina males during 1 to 7 days afer emergence (n = 30).
Fig. 1 in Factors and Variables that Affect Quality of Lepidopterans Used in SIT Programs General biology of Eldana saccharina (Lepidoptera: Pyralidae): A target for the sterile insect technique
Fig. 1. Mean percentage of eggs (± SE; n = 20) oviposited by Eldana saccharina adult females per night afer emergence.
Fig. 7 in Stable isotope markers differentiate between mass-reared and wild Lepidoptera in sterile insect technique programs
Fig. 7. Isotope signatures of the European grapevine moth, Lobesia botrana; error bars are 2 standard deviations of the mean.
Fig. 1 in Stable isotope markers differentiate between mass-reared and wild Lepidoptera in sterile insect technique programs
Fig. 1. Percentage of sucrose based on dry weight (DW) in popular artificial diets for mass rearing various moth species, as described by Dyck (2010).
Fig. 3 in Stable isotope markers differentiate between mass-reared and wild Lepidoptera in sterile insect technique programs
Fig. 3. Isotope signatures of the African sugarcane borer, Eldana saccharina. Wild moths developed on sugarcane at Eston, and at Tinely Manor, a 3rd group developed on papyrus at Eston and a 4th group was mass reared on an artificial diet. Error bars are 3 standard deviations of the mean.
Fig. 2 in Stable isotope markers differentiate between mass-reared and wild Lepidoptera in sterile insect technique programs
Fig. 2. Isotope signatures of cactus, a laboratory formulated diet and of cactus moths, Cactoblastis cactorum, reared on these 2 substrates; error bars are 2 standard deviations of the mean.
Fig. 4 in Stable isotope markers differentiate between mass-reared and wild Lepidoptera in sterile insect technique programs
Fig. 4. Isotope signature of the light brown apple moth, Epiphyas postvittana (LBAM); error bars are 2 standard deviations of the mean.
Fig. 2 in Methods to separate Lobesia botrana (Lepidoptera: Tortricidae) males from females for the implementation of sterile insect-inherited sterility technique control tactics
Fig. 2. Fifh instar larvae of Lobesia botrana indicating various shades of blue and green.
Data from: Laboratory rearing of Anopheles arabiensis: impact on genetic variability and implications for Sterile Insect Technique (SIT) based mosquito control in northern Sudan
Background: Mosquito colony populations often show significant changes in their population genetic make-up compared to the field populations that were used as founding source. Most of the changes that have been reported are indicators of depletion in the overall genetic diversity of the colony populations. The Sterile Insect Techniques programme of mosquito control that is underway in Northern Sudan uses sterilized males produced from a laboratory-maintained colony population. The genetic diversity of an advanced generation of this colony population was quantitatively assessed and compared to the field population from which the colony was derived. Methods: Anopheles arabiensis mosquito samples from the 13th generation of the colony, and from the locality that was the source of the first generation of the colony, were genotyped at 11 microsatellite loci distributed throughout the species' genome. Standard population genetic analyses were carried out to quantify and compare their population genetic make-up and diversities. Results: The colony samples showed significant reduction in the total number of alleles, the numbers of rare and private alleles, and the fractions of heterozygote individuals at all the loci. The pattern of change is consistent with the expected effect of the use of a small number of mosquitoes when the colony was established. Departure from Hardy–Weinberg equilibrium in the direction of homozygote excess was observed at some loci and attributed to the presence of null-alleles. Conclusions: This study highlights the need for broad sampling when initiating colony populations and for ongoing assessment of the population genetic make-up of colony populations. Previous assessments of survivorship, dispersive behaviour and swarm formation indicate that the inbreeding and reduced genetic variability reported in this study may not have had direct fitness consequences yet. However, noting the lessons learned in other SIT programmes about the impact of colonization on male sexual behaviour and longevity, as well as other inbreeding related adverse effects, a systematic investigation of these potential effects is recommended because they have direct impact on the ultimate success of the programme.
Data from: Laboratory rearing of Anopheles arabiensis: impact on genetic variability and implications for Sterile Insect Technique (SIT) based mosquito control in northern Sudan
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Data from: Directional selection to improve the sterile insect technique (SIT): survival and sexual performance of desiccation resistant Anastrepha ludens strains
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