Disrtibution of the sweetpotato weevil, Cylas formicarius (Fabricius) and the West Indian sweetpotato weevil, Euscepes postfasciatus (Fairmaire) in Okinawa Prefecture.

Yasuda, Keiji; Kohama, Tsuguo

doi:10.4241/kyubyochu.36.123

Cited by 60 publications

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“…The West Indian sweet potato weevil, Euscepes postfasciatus (Fairmaire), is a major pest of sweet potato, Ipomoea batatas (L.) Lam., in the South Pacific, the Caribbean, and some parts of Central and South America (Chalfant et al, 1990;Jansson and Raman, 1991;Raman and Alleyne, 1991;Sherman and Tamashiro, 1954;Yasuda, 1993;Yasuda and Kohama, 1990). This weevil is considered to have been accidentally introduced into Okinawa from Hawaii or Saipan (Kohama, 1990;Takara, 1954) and is now distributed throughout the Ryukyu Islands (Okinawa Prefecture) and the Amami Islands (Kagoshima Prefecture) (Yasuda and Kohama, 1990;Moriya, 1997).…”

Section: Introductionmentioning

confidence: 95%

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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Section: Introductionmentioning

confidence: 95%

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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“…(Convolvulaceae) in the tropics and subtropics, including Japan (Chalfant et al 1990;Yasuda and Kohama 1990;Jansson and Raman 1991;Raman and Alleyne 1991;Yasuda 1993). Movement of weevils and their host plants, including sweet potato, from infested to uninfested areas is strictly prohibited under the Japanese Plant Protection Law.…”

Section: Introductionmentioning

confidence: 99%

Effect of low temperature between fractionated-dose irradiation doses on mating of the West Indian sweetpotato weevil, Euscepes postfasciatus (Coleoptera: Curculionidae)

et al. 2011

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The effectiveness of the sterile insect technique (SIT) depends on the ability of released sterile males to mate with and inseminate wild females, but the use of gamma radiation to induce sterility negatively affects both somatic and reproductive cells of the sterilized insects. Recently, the effectiveness of fractionated-dose irradiation (FI), in which a sterilizing dose is delivered over time in a series of small irradiations, has been demonstrated in the West Indian sweetpotato weevil Euscepes postfasciatus (Fairmaire). FI improves male mating propensity compared with acute irradiation; however, this renewed technique takes a long time (72 h in the present circumstances) compared with the traditional technique (approximately 20 min) using single-dose irradiation (150 Gy) to fully sterilize this weevil. The extra time required by FI might negatively affect the quality of released sterile males, because weevils expend limited resources, such as metabolic energy or sperm, in mating freely in this period. We evaluated whether the temporal storage of weevils at low temperature (5°C and 15°C) improves the quality of sterile males compared with the normal condition (25°C). Temporal storage at low temperature in FI improves male mating propensity. For example, the sexually active phase of males exposed to 15°C was 18 days at least after irradiation. This period was longer than that of normal males (14 days). Meanwhile, this manner delayed male reproductive development and temporarily reduced mating competitiveness ability. If considering the long active phase of sterile males exposed to 15°C, these disadvantage would be cancelled out. We discuss the advantage of FI with temporal storage at low temperature in the eradication program using SIT for E. postfasciatus.

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“…Cylas formicarius is one of the most important pests of sweet potato, Ipomoea batatas (L.) Lam., which is cultivated in the South Pacific, the Caribbean Basin, and some countries of Central and South America (Chalfant et al 1990;Yasuda and Kohama 1990;Jansson and Raman 1991;Yasuda 1993). Even low levels of pre-and postharvest infestations can reduce both quality and marketable yield.…”

Section: Introductionmentioning

confidence: 99%

Pre-exposure to sex pheromone did not affect mating behavior in the sweetpotato weevil Cylas formicarius

et al. 2010

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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.

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Disrtibution of the sweetpotato weevil, Cylas formicarius (Fabricius) and the West Indian sweetpotato weevil, Euscepes postfasciatus (Fairmaire) in Okinawa Prefecture.

Cited by 60 publications

References 0 publications

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

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

Effect of low temperature between fractionated-dose irradiation doses on mating of the West Indian sweetpotato weevil, Euscepes postfasciatus (Coleoptera: Curculionidae)

Pre-exposure to sex pheromone did not affect mating behavior in the sweetpotato weevil Cylas formicarius

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