@article {15151,
	title = {A new species of Bracon (Hymenoptera: Braconidae) parasitic on alien sweetpotato weevils in the south-west islands of Japan},
	journal = {Entomological Science},
	volume = {10},
	number = {1},
	year = {2007},
	month = {March},
	pages = {55-63},
	abstract = {A new species of braconid, Bracon yasudai Maeto et Uesato sp. nov., is described here from the south-west islands of Japan. It is a solitary idiobiont ectoparasitoid of the larvae of the West Indian sweetpotato weevil, Euscepes postfasciatus (Curculionidae), and the sweetpotato weevil, Cylas formicarius (Brentidae), both feeding on Ipomoea batatas (L.) (Convolvulaceae). The percentage parasitism of the braconid on E. postfasciatus in the vines of I. batatas was 19.9-40.7\% in the field. Bracon cylasovorus (Rohwer) reared from C. formicarius in the Philippines is also described.},
	keywords = {Cylas formicarius, Euscepes postfasciatus},
	isbn = {1343-8786},
	author = {Maeto, Kaoru and Uesato, Takumi}
}
@article {14335,
	title = {A new species of Bracon (Hymenoptera: Braconidae) parasitic on alien sweetpotato weevils in the south-west islands of Japan},
	journal = {Entomological Science},
	volume = {10},
	number = {1},
	year = {2007},
	month = {March},
	pages = {55-63},
	abstract = {A new species of braconid, Bracon yasudai Maeto et Uesato sp. nov., is described here from the south-west islands of Japan. It is a solitary idiobiont ectoparasitoid of the larvae of the West Indian sweetpotato weevil, Euscepes postfasciatus (Curculionidae), and the sweetpotato weevil, Cylas formicarius (Brentidae), both feeding on Ipomoea batatas (L.) (Convolvulaceae). The percentage parasitism of the braconid on E. postfasciatus in the vines of I. batatas was 19.9-40.7\% in the field. Bracon cylasovorus (Rohwer) reared from C. formicarius in the Philippines is also described.},
	keywords = {Cylas formicarius, Euscepes postfasciatus},
	isbn = {1343-8786},
	author = {Maeto, Kaoru and Uesato, Takumi}
}
@article {14012,
	title = {Pre-exposure to sex pheromone did not affect mating behavior in the sweetpotato weevil Cylas formicarius},
	journal = {Journal of Pest Science},
	volume = {84},
	number = {1},
	year = {2011},
	month = {March},
	pages = {93-97},
	abstract = {In sterile insect technique (SIT) programs, the released sterile males are important for their effectiveness. The use of sex pheromones to collect males is economical; however, pre-exposure to sex pheromones may affect male mating behavior, and would thus reduce the effectiveness of the SIT programs. Males exposed to sex pheromone may become attractive to other males due to pheromone adsorption on their body impregnation, prevent mating and reduce the dispersal of sterile males. We examined the effect of pre-exposure to sex pheromone on the mating behavior of male sweetpotato weevil Cylas formicarius. Pre-exposure to high-dose sex pheromone for 24 h did not affect the male mating behavior of C. formicarius, and the exposed males did not attract other males. These results suggest that male C. formicarius that were collected from a mass-rearing facility using sex pheromone can be effectively used in SIT programs.},
	keywords = {Cylas formicarius},
	isbn = {1612-4758},
	author = {Kuriwada, Takashi and Kumano, Norikuni and Shiromoto, Keiko and Haraguchi, Dai}
}
@article {14011,
	title = {Age-dependent investment in death-feigning behaviour in the sweetpotato weevil Cylas formicarius},
	journal = {Physiological Entomology},
	volume = {36},
	number = {2},
	year = {2011},
	month = {Jun},
	pages = {149-154},
	abstract = {Because life-history theory predicts that risky behaviours such as mating should increase as life expectancy decreases, predatory avoidance is expected to decrease with age. However, this prediction has not been examined. In the present study, the effect of age on death-feigning behaviour, a form of predatory avoidance behaviour in the sweetpotato weevil Cylas formicarius (Summers) (Coleoptera: Brentidae), is investigated by performing a longitudinal study. Because the effects of mating history and age usually cannot be distinguished, mating history is controlled. The results show that only female weevils decrease the investment in death-feigning behaviour with age, whereas male weevils do not show any age-related change. In addition, death-feigning behaviour of mated females is longer than that of virgin females, possibly because additional mating partners would be not needed by mated females.},
	keywords = {Cylas formicarius},
	isbn = {0307-6962},
	author = {Kuriwada, Takashi and Kumano, Norikuni and Shiromoto, Keiko and Haraguchi, Dai}
}
@article {14008,
	title = {EFFECT OF IRRADIATION ON DEATH-FEIGNING BEHAVIOR IN THE MALE SWEETPOTATO WEEVIL CYLAS FORMICARIUS (COLEOPTERA: BLENTIDAE)},
	journal = {Florida Entomologist},
	volume = {93},
	number = {1},
	year = {2010},
	month = {March},
	pages = {39-44},
	abstract = {The sterile insect technique (SIT) is widely used to suppress or eradicate target insect pest populations. The effectiveness of SIT depends on the ability of the released sterile males to mate with and inseminate wild females. Irradiation is effective for sterilizing mass-reared insects, and the negative impacts of this procedure are not limited to reproductive cell damage. In this study, we evaluated the death-feigning that is considered as an antipredator behavior of male Cylas formicarius (Summers) (Coleoptera: Blentidae) irradiated with 200 Gy, which is the dose used in the SIT program in Okinawa Prefecture. Irradiated male insects were observed in the laboratory for 10 d after irradiation. On d 0, fewer irradiated males feigned death than nonirradiated males. The number of irradiated and nonirradiated males who feigned death and the duration of their death-feigning were about the same from 2 d after irradiation. On the basis of our results, we discuss the optimal release time of irradiated male C. formicarius.},
	keywords = {Cylas formicarius},
	isbn = {0015-4040},
	author = {Kuriwada, Takashi and Kumano, Norikuni and Shiromoto, Keiko and Haraguchi, Dai}
}
@article {14010,
	title = {Inbreeding avoidance or tolerance? Comparison of mating behavior between mass-reared and wild strains of the sweet potato weevil},
	journal = {Behavioral Ecology and Sociobiology},
	volume = {65},
	number = {7},
	year = {2011},
	month = {July},
	pages = {1483-1489},
	abstract = {Inadvertent selection is an important genetic process that frequently occurs during laboratory culture. The mass-reared strain of the sweet potato weevil Cylas formicarius exhibits stronger inbreeding depression than the wild strain does. When inbreeding depression occurs in a population, mating with a close relative is often considered maladaptive; however, in some contexts, the inclusive fitness benefits of inbreeding may outweigh the costs, favoring individuals that tolerate a low level of inbreeding depression. Theory predicts that mass-reared strain weevils will avoid inbreeding while wild strain weevils will tolerate inbreeding. To examine this prediction, we compared the effect of relatedness on the mating and insemination successes in mass-reared and wild strains of C. formicarius. While close relative pairs of the wild strain copulated less frequently than non-kin pairs, almost all mass-reared strain pairs copulated irrespective of relatedness. The results showed that the strain with weak inbreeding depression (wild strain) avoided inbreeding, whereas the strain with strong inbreeding depression (mass-reared strain) tolerated inbreeding. The contradiction between the theoretical prediction and our results is discussed from the perspective of laboratory adaptation, mating systems, and life history of C. formicarius.},
	keywords = {Cylas formicarius},
	isbn = {0340-5443},
	author = {Kuriwada, Takashi and Kumano, Norikuni and Shiromoto, Keiko and Haraguchi, Dai}
}
@article {14006,
	title = {The effect of mass-rearing on death-feigning behaviour in the sweet potato weevil (Coleoptera: Brentidae)},
	journal = {Journal of Applied Entomology},
	volume = {134},
	number = {8},
	year = {2010},
	month = {Sep},
	pages = {652-658},
	abstract = {The aim of our study was to examine the effect of mass-rearing, in which there is no exposure to predators, on antipredator traits of insects for improving sterile insect technique programs. The duration of death-feigning (antipredator behaviour) in sweet potato weevil Cylas formicarius (Summers) (Coleoptera: Brentidae) after mass-rearing for 71 generations were compared with those in wild strain. There was no significant difference in the duration of death-feigning between wild and mass-reared strains. This indicated that the death-feigning behaviour of mass-reared strain was maintained for 71 generations even in the absence of,predators. We discuss the reasons why death-feigning behaviour is maintained after mass-rearing.},
	keywords = {Cylas formicarius},
	isbn = {0931-2048},
	author = {Kuriwada, T. and Kumano, N. and Shiromoto, K. and Haraguchi, D.}
}
@article {13306,
	title = {A convenient estimation of the sources of sweet potato weevils, Cylas formicarius (Fabricius) (Coleoptera: Brentidae), in recently invaded areas in Japan, by random amplified polymorphic DNA technique},
	journal = {Applied Entomology and Zoology},
	volume = {42},
	number = {2},
	year = {2007},
	month = {May},
	pages = {297-303},
	keywords = {Cylas formicarius},
	isbn = {0003-6862},
	author = {Kawamura, Kiyohisa and Sugimoto, Tuyosi and Matsuda, Yoshinori and Toyoda, Hideyoshi}
}
@article {13303,
	title = {Geographic variation of elytral color in the sweet potato weevil, Cylas formicarius (Fabricius) (Coleoptera: Brentidae), in Japan},
	journal = {Applied Entomology and Zoology},
	volume = {44},
	number = {4},
	year = {2009},
	month = {Nov},
	pages = {505-513},
	abstract = {To use elytral color morphs of Cylas formicarius as a genetic marker in its eradication using the sterile insect technique, the geographic distribution of the morphs was examined in the three main infested areas of Japan (Central Ryukyus, Southern Ryukyus, and Ogasawara Islands). In addition to the two known color morphs in Japan (bluish elytra (BE) and greenish elytra. (GE)), the piceous elytra (PE) was found mainly in the Southern Ryukyus at low frequency. The color morph frequencies varied between the Central and Southern Ryukyus and between locations within the two areas, while only BE was found in the Ogasawara Islands. PE would be useful for genetically marking sterile weevils to be released. Similarly, GE would be useful in some islands where GE is rarely or not found. BE frequencies on two islands in the Central Ryukyus (Amami and Okinawa) and two islands in the Southern Ryukyus (Miyako and Ishigaki) in 2006-2007 were higher than in 2002-2003.},
	keywords = {Cylas formicarius},
	isbn = {0003-6862},
	author = {Kawamura, Kiyohisa and Ohno, Suguru and Haraguchi, Dai and Kawashima, Shunji and Kohama, Tsuguo}
}
@article {13304,
	title = {PCR-RFLP Discrimination between Okinawa and Ogasawara Strains of the Sweet Potato Weevil, Cylas formicarius (Fabricius)},
	journal = {Japanese Journal of Applied Entomology and Zoology},
	volume = {53},
	number = {2},
	year = {2009},
	month = {2009},
	pages = {60-63},
	abstract = {To establish a simple method for discriminating Okinawa and Ogasawara strains of the sweet potato weevil, Cylas formicarius, about 560 bp of the internal transcribed spacer-1 (ITS-1) region of the ri- bosomal DNA (rDNA) of C. formicarius was collected from several is- lands of Okinawa Prefecture and Ogasawara Islands and analyzed by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). The 345 weevils collected in Okinawa and Ogasawara were discriminated correctly by the RFLP patterns with the restriction enzyme RsaI. The results suggest that C. formicarius originating from Ogasawara Islands is an effective genetic marking strain for an eradica- tion project using the sterile insect technique implemented by the Oki- nawa prefectural government.},
	keywords = {Cylas formicarius},
	isbn = {0021-4914},
	author = {Kawamura, Kiyohisa and Ohno, Suguru and Haraguchi, Dai and Kohama, Tsuguo}
}
@article {13305,
	title = {Genetic variation of sweet potato weevils, Cylas formicarius (Fabricius) (Coleoptera: Brentidae), in main infested areas in the world based upon the internal transcribed spacer-1 (ITS-1) region},
	journal = {Applied Entomology and Zoology},
	volume = {42},
	number = {1},
	year = {2007},
	month = {February},
	pages = {89-96},
	keywords = {Cylas formicarius},
	isbn = {0003-6862},
	author = {Kawamura, Kiyohisa and Sugimoto, Tuyosi and Kakutani, Koji and Matsuda, Yoshinori and Toyoda, Hideyoshi}
}
@article {13054,
	title = {Evaluation of pheromone traps for monitoring sweetpotato weevils},
	journal = {Journal of Agricultural and Urban Entomology},
	volume = {23},
	number = {3},
	year = {2006},
	month = {July},
	pages = {141-158},
	abstract = {Ten types of pheromone traps for monitoring sweetpotato weevils, Cylas formicarius (F.) (Coleoptera: Brentidae), were evaluated in sweetpotato fields at the U.S. Vegetable Laboratory, Charleston, South Carolina, during 2001 and 2002. A funnel trap, a modification of a water-pan trap, and the Pherocon sticky trap were the most effective for capturing male sweetpotato weevil adults. A universal trap, Multipher trap, boll weevil trap, a trap constructed from a five-gallon pail, and a trap made from a milk jug also captured significant numbers of weevils. A Japanese beetle trap and the plastic Pherocon CRW kairomone trap were not effective for trapping sweetpotato weevils. In separate experiments in 2005 and 2006, a trap made from a recycled plastic (PET) soft drink bottle was significantly less effective than the universal trap. Universal traps and PET bottle traps with soapy water were as effective as traps with a dichlorvos insecticide strip for a killing agent. Captures of male sweetpotato weevils in universal traps ranged 0.0-6.0 adults per trap per day during a 6-year period, 2001-2006 at the U.S. Vegetable Laboratory. Except for 2005, when population levels were unusually low, weevil captures increased rapidly during August and continued at high levels until freezing weather in November or December each year. Peak captures were generally from mid-September to mid-October.},
	keywords = {Cylas formicarius},
	isbn = {1523-5475},
	author = {Jackson, D. Michael and Bohac, Janice R.}
}
