01884nas a2200193   4500008004100000020001400041245012600055210006900181260000800250300001400258490000800272520117300280653003401453100001701487700001501504700001801519700001801537856013501555       2010                        eng d  a0022-049300aEffect of Mass Rearing on Life History Traits and Inbreeding Depression in the Sweetpotato Weevil (Coleoptera: Brentidae)0 aEffect of Mass Rearing on Life History Traits and Inbreeding Dep  cAug  a1144-11480 v1033 aInadvertent selection is an important genetic process that frequently occurs during laboratory culture and maintenance of biological control agents and other beneficial organisms used in procedures such as the sterile insect technique (SIT). We investigated effects of mass rearing and inbreeding depression on life history traits (number of progeny emerging from host plants, body weight, developmental period, and starvation tolerance) in the sweetpotato weevil, Cylas formicarius elegantulus (Summers) (Coleoptera: Brentidae). The effect of inbreeding was measured by comparing the results obtained from the full-sib crosses with those obtained from nonkin crosses in both wild and mass-reared strains. The mass-reared strain had more progeny than the wild strain. The developmental period of mass-reared strain was shorter than that of the wild strain. Other traits did not differ significantly between strains. We detected inbreeding depression effects on numbers of progeny, and the effects were more pronounced in the mass-reared strain. Hence, laboratory adaptation to mass rearing can produce changes in important biological attributes of sweetpotato weevils.10aCylas formicarius elegantulus1 aKuriwada, T.1 aKumano, N.1 aShiromoto, K.1 aHaraguchi, D.  uhttps://weevil.myspecies.info/effect-mass-rearing-life-history-traits-and-inbreeding-depression-sweetpotato-weevil-coleoptera-bren02217nas a2200181   4500008004100000020001400041245011200055210006900167260000900236300001200245490000800257520155600265653003401821100002101855700001901876700001701895856012301912       2007                        eng d  a0022-049300aEffect of irradiation on dispersal ability of male sweetpotato weevils (Coleoptera: Brentidae) in the field0 aEffect of irradiation on dispersal ability of male sweetpotato w  cJune  a730-7360 v1003 aWe used the mark-and-recapture method in the field to test the effect of gamma radiation on the dispersal ability of the male sweetpotato weevil, Cylas formicarius elegantulus (Summers) (Coleoptera: Brentidae), a serious sweetpotato pest in Japan. To evaluate the dispersal ability of male sweetpotato weevil, we released 27,218 males (13,302 males irradiated with a dose of 200 Gy and 13,916 nonirradiated males) in two replications (September and October 2005). Each replication lasted 5 d from the release of weevils to the removal of traps, and male weevils were released twice (1 and 3 d before trap setting). Forty pheromone traps were placed in lines corresponding to eight compass directions and five distance classes (20,50,100,200, and 500 m) in each replication. We captured 2,263 irradiated males (17.0%) and 2,007 nonirradiated males (14.4%) in the two replications. Six irradiated and eight nonirradiated males were captured in the traps 500 m far from the release point. All parameters to evaluate the dispersal ability of irradiated male sweetpotato weevil (recapture rate, dispersal distance, and dispersal direction) were similar to nonirradiated males in three of the four trials. However, parameters were different between irradiated males and nonirradiated males in one trial. Because the majority of parameters consistently show that the similarity of the dispersal ability, we considered that male sweetpotato weevil irradiated with a dose of 200 Gy possessed equal dispersal ability to that of nonirradiated males in the field.10aCylas formicarius elegantulus1 aKumano, Norikuni1 aKohama, Tsuguo1 aOhno, Suguru  uhttps://weevil.myspecies.info/effect-irradiation-dispersal-ability-male-sweetpotato-weevils-coleoptera-brentidae-field02257nas a2200205   4500008004100000020001400041245011800055210006900173260000800242300001400250490000800264520152900272653003401801100001501835700001701850700001801867700001801885700001501903856013301918       2010                        eng d  a0022-049300aAssessment of Effect of Partial Sterility on Mating Performance in Sweetpotato Weevil (Coleoptera: Curculionidae)0 aAssessment of Effect of Partial Sterility on Mating Performance   cDec  a2034-20410 v1033 aThe sterile insect technique (SIT) is widely used to suppress or eradicate target pest insect populations. Although the effectiveness of SIT depends on the ability of released sterile males to mate with and inseminate wild females, the use of gamma radiation to induce sterility negatively impacts reproductive cells as well as somatic cells. Consequently, sterilization by irradiation drastically diminishes mating performance over time. In the current study, we evaluated the effect of irradiation dose intensity on fertility, mating propensity, and mating competitiveness in sweetpotato weevil, Cylas formicarius elegantulus (Summers) (Coleoptera: Curculionidae), for 16 d after irradiation. Although the mating propensity of males irradiated with 200 Gy, the dose currently used to induce complete sterility of C. f elegantulus in the SIT program in Okinawa Prefecture, was equal to that of nonirradiated weevils for the first 6 d, the mating propensity of males irradiated with doses between of 75 and 150 Gy was maintained for the first 12 d. The potential fertilization ability of weevils was highly depressed compared with the control weevils, even in those treated with 75 Gy. Mating performance was severely compromised in weevils that were irradiated with a dose of 100 Gy or more. These results demonstrate that partial sterilization can be highly advantageous in eradication programs for the sweetpotato weevil. We discuss the advantages of the application of partial irradiation in insect eradication programs.10aCylas formicarius elegantulus1 aKumano, N.1 aKuriwada, T.1 aShiromoto, K.1 aHaraguchi, D.1 aKohama, T.  uhttps://weevil.myspecies.info/assessment-effect-partial-sterility-mating-performance-sweetpotato-weevil-coleoptera-curculionidae01909nas a2200181   4500008004500000020001400045245010400059210006900163260001100232300001400243490000800257520126200265653003401527100001501561700001801576700001501594856011801609       2008                        Engldsh    a0022-049300aEffect of irradiation on malting ability in the male sweetpotato weevil (Coleoptera: Curculionidae)0 aEffect of irradiation on malting ability in the male sweetpotato  cAugust  a1198-12030 v1013 aThe sterile insect technique (SIT) is widely used for suppressing or eradicating target pest insect populations. The effectiveness of SIT depends on the ability of released sterile males to mate with and inseminate wild females. Irradiation is the effective manner to sterilize mass-reared insects. The negative impacts of this procedure are not limited to damage on reproductive cells. Gamma-radiation damages the epithelial tissue of midgut, which affects the alimentation in insects. Irradiated males alter their mating behavior over time because of the depression of metabolic activity by sterilization. In this study, we evaluated the male mating performance and sexually compatibility of irradiated male Cylas formicarius elegantulus (Summers) (Coleoptera: Curculionidae) with a 200-Gy dose, as currently used in the SIT program in Okinawa Prefecture, throughout 16 d after irradiation in the laboratory. The mating ability of irradiated males did not differ from that of control males for about a week. However, the mating ability of irradiated male drastically decreased thereafter. We consider that irradiated male C. formicarius elegantulus with a 200-Gy dose had no major effect on male mating behavior approximately for a week after irradiation.10aCylas formicarius elegantulus1 aKumano, N.1 aHaraguchi, D.1 aKohama, T.  uhttps://weevil.myspecies.info/effect-irradiation-malting-ability-male-sweetpotato-weevil-coleoptera-curculionidae