Effect of Simplifying the Preparation of Larval Artificial Diet on Survival and Development of the West Indian Sweetpotato Weevil Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae)

Urasaki, Kimiko; Ohno, Suguru; Haraguchi, Dai; Kohama, Tsuguo

doi:10.1303/jjaez.2009.1

Cited by 16 publications

(3 citation statements)

References 11 publications

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“…in vivo has decreased E. postfasciatus production in the mass‐rearing facility at the Okinawa Prefectural Plant Protection Center (OPPPC) (Kumano et al , 2010c). Although an artificial diet that enables the production of numerous sterile E. postfasciatus males in a cost‐effective manner under pathogen‐free conditions has been developed (Shimoji & Kohama, 1996; Shimoji & Miyatake, 2002; Shimoji & Yamagishi, 2004; Kuriwada et al , 2009; Urasaki et al , 2009), it has not yet been recognized as practical for mass production at OPPPC. Therefore, it is difficult to release large quantities of fully sterile E. postfasciatus males in Okinawa at this time, and the prolongation of the effective copulation period and enhancement of mating performance of sterile males is important in SIT programmes for eradication of this weevil.…”

Section: Introductionmentioning

confidence: 99%

Fractionated irradiation improves the mating performance of the West Indian sweet potato weevil Euscepes postfasciatus

Kumano

Kuriwada

Shiromoto

et al. 2011

Agricultural and Forest Entomology

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1 The sterile insect technique (SIT) is widely used to suppress or eradicate target pest insect populations. 2 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, however, negatively affects both somatic cells as well as reproductive cells.Consequently, mating performance of sterilized individuals decreases drastically over time. The mating propensity of sterilized Euscepes postfasciatus (Fairmaire) males irradiated with a single dose of 150 Gy (the current standard of the Okinawa Prefecture SIT programme) is equal to that of non-irradiated weevils for the first 6 days. 3 Fractionated irradiation, in which a sterilizing dose is delivered over time in a series of smaller irradiations, reduces the damage of irradiation in insects. In the present study, we evaluated the effect of fractionated irradiation on male fertilization ability, longevity and mating propensity of E. postfasciatus for a period of 16 days after irradiation. 4 Although fractionated irradiation totalling 150 Gy was found to induce full sterility regardless of the number of individual doses, the mating propensity of male weevils sterilized by fractionated irradiation was maintained for the first 12 days. These results demonstrate that fractionated irradiation can be highly advantageous in programmes aimed at eradication of E. postfasciatus.

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Section: Introductionmentioning

confidence: 99%

Fractionated irradiation improves the mating performance of the West Indian sweet potato weevil Euscepes postfasciatus

Kumano

Kuriwada

Shiromoto

et al. 2011

Agricultural and Forest Entomology

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“…Contact with contaminated feces from parental weevils is prevented by sterilization of collected weevil eggs using 70% ethanol and 5% formaldehyde (Ohno et al, 2008), and newly emerged weevils do not encounter diseased weevils. An artificial diet has also been developed for E. postfasciatus (Kuriwada et al, 2009;Shimoji and Kohama, 1996;Shimoji and Miyatake, 2002;Shimoji and Yamagishi, 2004;Urasaki et al, 2009). Significantly, weevils infected with Farinocystis sp.…”

Section: Discussionmentioning

confidence: 99%

The neogregarine protozoan Farinocystis sp. reduces longevity and fecundity in the West Indian sweet potato weevil, Euscepes postfasciatus (Fairmaire)

Kumano

Iwata

Kuriwada

et al. 2010

Journal of Invertebrate Pathology

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“…For antibiotic treatments, we used an agar-based artificial diet for E. postfasciatus consisting of sweet potato powder, sugar, soybean protein, cellulose, yeast, agar, vitamins and other ingredients [44] . Antibiotics were added to milled artificial diet (ca.…”

Section: Methodsmentioning

confidence: 99%

Biological Role of Nardonella Endosymbiont in Its Weevil Host

et al. 2010

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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 the diverse microbial associates of weevils, Nardonella spp. represent the most ancient and widespread endosymbiont lineage, having co-speciated with the host weevils for over 125 million years. Thus far, however, no empirical work on the role of Nardonella for weevil biology has been reported. Here we investigated the biological role of the Nardonella endosymbiont for the West Indian sweet potato weevil, Euscepes postfasciatus. This insect is an experimentally tractable pest insect that can easily be reared on a natural diet of sweet potato root as well as on an agar-based artificial diet. By larval feeding on an antibiotic-containing artificial diet, Nardonella infection was effectively eliminated from the treated insects. The antibiotic-treated insects exhibited significantly lighter body weight and lower growth rate than the control insects. Then, the antibiotic-treated insects and the control insects were respectively allowed to mate and oviposit on fresh sweet potatoes without the antibiotic. The offspring of the antibiotic-treated insects, which were all Nardonella-negative, exhibited significantly lighter body weight, smaller body size, lower growth rate and paler body color in comparison with the offspring of the control insects, which were all Nardonella-positive. In conclusion, the Nardonella endosymbiont is involved in normal growth and development of the host weevil. The biological role of the endosymbiont probably underlies the long-lasting host-symbiont co-speciation in the evolutionary course of weevils.

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Effect of Simplifying the Preparation of Larval Artificial Diet on Survival and Development of the West Indian Sweetpotato Weevil Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae)

Cited by 16 publications

References 11 publications

Fractionated irradiation improves the mating performance of the West Indian sweet potato weevil Euscepes postfasciatus

Fractionated irradiation improves the mating performance of the West Indian sweet potato weevil Euscepes postfasciatus

The neogregarine protozoan Farinocystis sp. reduces longevity and fecundity in the West Indian sweet potato weevil, Euscepes postfasciatus (Fairmaire)

Biological Role of Nardonella Endosymbiont in Its Weevil Host

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