Weevils constitute the most species-rich animal group with over 60,000 described species, many of which possess specialized symbiotic organs and harbor bacterial endosymbionts. Among diverse microbial associates weevils, Nardonella spp. represent ancient widespread endosymbiont lineage, having co-speciated host weevils for 125 million years. Thus far, however, no empirical work on role weevil biology has been reported. Here we investigated biological West Indian sweet potato weevil, Euscepes...

This paper presents the first case of successful eradication a Coleoptera pest species over wide area using combination male annihilation technique (MAT) and sterile insect (SIT) application. The sweet potato weevil, Cylas formicarius, is one most destructive widely distributed pests potato, Ipomoea batatas. A project to eradicate it was launched in 1994 on Kume Island, Okinawa Prefecture, Japan. MAT application used from November January 1999 reduce density wild populations. distribution...

Abstract The sterile insect technique (SIT) is widely used for suppressing or eradicating target pest populations. effectiveness of SIT depends on the ability released males to mate with and inseminate wild females. Irradiation not only damages reproductive cells but somatic as well. mating behavior irradiated may be altered over time due depressed metabolic activity brought about by sterilization. In this study, we evaluated (copulation behavior, performance, sperm transfer) in Euscepes...

The sterile insect technique (SIT) is widely used for suppressing or eradicating target pest populations. effectiveness of SIT depends on the ability released males to mate with and inseminate wild females. Irradiation effective manner sterilize mass-reared insects. negative impacts this procedure are not limited damage reproductive cells. Gamma-radiation damages epithelial tissue midgut, which affects alimentation in Irradiated alter their mating behavior over time because depression...

The West Indian sweetpotato weevil Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae) is a major pest of Ipomoea batatas (L.) Lam (Solanales: Convolvulaceae) in some countries. In order to improve mass-rearing for an eradication program employing the sterile insect technique (SIT), optimal population density E. artificial diet was examined. Six densities (1000, 4000, 7000, 10000, 13000, and 16000 individuals per container with 200 g diet) were compared effect on number eggs...

Journal Article Effect of Mass Rearing on Life History Traits and Inbreeding Depression in the Sweetpotato Weevil (Coleoptera: Brentidae) Get access T. Kuriwada, Kuriwada 3 3Corresponding author, e-mail: t.kuriwada@gmail.com Search for other works by this author on: Oxford Academic PubMed Google Scholar N. Kumano, Kumano K. Shiromoto, Shiromoto D. Haraguchi Economic Entomology, Volume 103, Issue 4, 1 August 2010, Pages 1144–1148, https://doi.org/10.1603/EC09361 Published: 01 2010 history...

Because life‐history theory predicts that risky behaviours such as mating should increase life expectancy decreases, predatory avoidance is expected to decrease with age. However, this prediction has not been examined. In the present study, effect of age on death‐feigning behaviour, a form behaviour in sweetpotato weevil Cylas formicarius (Summers) (Coleoptera: Brentidae), investigated by performing longitudinal study. effects history and usually cannot be distinguished, controlled. The...

The sterile insect technique (SIT) is widely used for suppressing or eradicating target pest populations. effectiveness of SIT depends on the ability released males to mate with and inseminate wild females. Irradiation effective manner sterilize mass-reared insects. negative impacts this procedure are not limited damage reproductive cells. Gamma-radiation damages epithelial tissue midgut, which affects alimentation in Irradiated alter their mating behavior over time because depression...

Abstract Male body size is considered to be one of the major determinants mating success among many insect species. Because effectiveness sterile technique (SIT) depends on ability released males mate with and inseminate wild females, it indispensable understand effect male behavior both sexes for progress SIT program. We investigated how presence other rival affect guarding copulatory durations West Indian sweetpotato weevil, Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae)....

Abstract An eradication project against the sweetpotato weevil, Cylas formicarius ( Fabricius) (Coleoptera: Brentidae), one of most important pests sweet potato in world, was initiated Oct. 2007 on Tsuken Island, Okinawa Prefecture, Japan. The sterile insect technique (SIT) and male annihilation (MAT) were employed as main control measures to suppress ultimately eradicate wild populations by impeding normal mating. In addition, two monitoring methods (host plant survey trap survey) used...

Abstract The effect of irradiation on the dispersal ability males and females flightless West Indian sweetpotato weevil, Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae), a major sweet potato pest, was examined in field using mark–release–recapture techniques. To evaluate we released 7 619 weevils two replicates (July August 2007). Each replicate lasted 5 days from release to sampling consisted one weevil samplings. Thirty‐two traps were placed lines corresponding eight compass...

Preparing the larval artificial diet of Euscepes postfasciatus involves two procedures: pre-processing ingredients, and mixing heating, both which are complicated. To simplify preparation, we compared survival development E. among three versions diet: previous version (diet A), B in ingredients (dried sweet potato, vitamin mixture salt mixture) were replaced by ready-processed commercial products without modifying heating process, C simplified using same as for B. For B, rate was higher time...

Abstract Because multiple mating by females encourages sperm competition, the assessment of female status before insemination is important for males in order to avoid risk competition or intensify competition. When interacting with transfer, can alter their tactics according intensity Information on how systems are associated essential sterile insect technique eradication programs, which depend successful released wild females. We tested whether West Indian sweetpotato weevil, Euscepes...

When there is an inbreeding depression, mating with a kin individual generally considered maladaptive behaviour. However, in some conditions, the inclusive fitness benefits from may outweigh costs of and thus, tolerance often adaptive. Inbreeding depression effect relatedness on behaviour West Indian sweet potato weevil Euscepes postfasciatus were examined. No significant was detected as indicated by body weight number progeny emerging roots. Male performance (i.e. occurrences per night)...

1 The sterile insect technique (SIT) is widely used to suppress or eradicate target pest populations. 2 effectiveness of SIT depends on the ability released males mate with and inseminate wild females. use gamma radiation induce sterility, however, negatively affects both somatic cells as well reproductive cells. Consequently, mating performance sterilized individuals decreases drastically over time. propensity Euscepes postfasciatus (Fairmaire) irradiated a single dose 150 Gy (the current...

Journal Article Mating Success in Bactrocera cucurbitae (Diptera: Tephritidae) Under Different Rearing Densities Get access Takahisa Miyatake, Miyatake Okinawa Prefectural Agricultural Experiment Station, 4-222 Sakiyama-cho, Naha, 903, Japan. Search for other works by this author on: Oxford Academic Google Scholar Dai Haraguchi 1 1Current address: Miyako Extension Office, 2071-54 Nishizato, Hirara, 906, Annals of the Entomological Society America, Volume 89, Issue 2, March 1996, Pages...

Abstract Persistent mating attempts by males (sexual harassment) are frequently observed among animals. For females, resisting persistent can be costly because vigorous resistance increases both energy expenditure and the possibility of injury. Although one tactic for coping with male harassment is to cease mate partner, females several species able prevent fertilization their egg(s) despite copulation. In this study, we used three different sex ratios investigate whether a male's...