The effect of egg-surface treatment with ethanol on post-hatching survival and development of the West Indian sweetpotato weevil, Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae).

Ohno, Suguru; Sasaki, Takehiro; Urasaki, Kimiko; Kohama, Tsuguo

doi:10.4241/kyubyochu.50.40

Cited by 16 publications

(4 citation statements)

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“…In the present study, the maximum post-hatching survival rate of E. postfasciatus was 40%, which is still lower than under previous rearing methods in which FS was not used (60-73%; Shimoji et al, 1999;Ohno et al, 2004Shimoji and Yamagishi, 2004); therefore, there is still room for further improvement of the survival rate of this weevil. This improvement may be realized by refining the methods used for removing and drying FS after egg seeding, as suggested below.…”

Section: Discussioncontrasting

confidence: 66%

“…The weevils used in this study were originally collected in Yomitan Village, Okinawa Island, in August 1994 and cultured on sweet potato tuberous roots at the Fruit Fly Eradication Project Office under conditions of 25Ϯ1°C, 50-90% RH and 14L10D (five generations per year). The eggs were obtained in January 2004 as described in Ohno et al (2004Ohno et al ( , 2006b, and incubated in a plastic Petri dish lined with dry filter paper in an incubator (MIR-253, Sanyo Electric Co. Ltd., Tokyo, Japan; 25Ϯ1°C, 14L10D) for six days. After incubation, the eggs were moistened, carefully separated using a tiny brush, and submersed in 14% saltwater.…”

Section: Methodsmentioning

confidence: 99%

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Improvement of survival of the West Indian sweet potato weevil, Euscepes postfasciatus (Coleoptera: Curculionidae), by placing absorbent paper on the artificial diet after egg seeding and ensuring air permeability of the rearing tray

Ohno

Sasaki

Urasaki

et al. 2009

Appl. Entomol. Zool.

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A remarkable reduction of the post-hatching survival rate caused by adopting the furcellaran solution (a viscous liquid, hereafter FS) as an egg-seeding agent has become a problem during development of mass-rearing methods for the West Indian sweet potato weevil (Euscepes postfasciatus) using an artificial diet. We hypothesized that FS physically inhibits the feeding of hatched larvae on the diet, and predicted that removing and/or drying FS after egg seeding would improve the survival of E. postfasciatus. To confirm this prediction, we examined the effects of two post-eggseeding treatments (placing absorbent paper on the diet surface and ensuring air permeability of the rearing tray) on the survival and development of the weevils. Neither of the two treatments worked well individually, but they exhibited a clear synergistic positive effect on weevil survival. Their survival rate jumped from 2% to 40% when these two treatments were combined, without any adverse effects on the developmental period and the adult body size. These treatments thus enabled the FS-based egg-seeding method, which is much simpler than previous methods, clearly contributing to the establishment of a mass-rearing system for E. postfasciatus.

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Section: Discussioncontrasting

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Improvement of survival of the West Indian sweet potato weevil, Euscepes postfasciatus (Coleoptera: Curculionidae), by placing absorbent paper on the artificial diet after egg seeding and ensuring air permeability of the rearing tray

Ohno

Sasaki

Urasaki

et al. 2009

Appl. Entomol. Zool.

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“…When there were very few eggs and the number could not be estimated by this method, we counted the eggs directly. For surface disinfection, the eggs were dipped in 70% ethanol solution for 40 min, and then rinsed with sterile water (modified from Ohno et al 2004). The hatchability of the eggs was then determined (see hatchability section).…”

Section: Egg Collectionmentioning

confidence: 99%

High Population Density and Egg Cannibalism Reduces the Efficiency of Mass-Rearing inEuscepes postfasciatus(Coleoptera: Curculionidae)

Kuriwada

Kumano

Shiromoto

et al. 2009

Florida Entomologist

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“…The sex ratios observed in the field and in the laboratory do not deviate significantly from 1 : 1 (Ohno et al. 2004); therefore, the sex ratio in the population was assumed to be 1 : 1.…”

Section: Methodsmentioning

confidence: 99%

Population dynamics of the West Indian sweetpotato weevil Euscepes postfasciatus (Fairmaire): a simulation analysis

Sato

Miyai

Haraguchi

et al. 2010

J Applied Entomology

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The West Indian sweetpotato weevil Euscepes postfasciatus (Fairmaire) is a major pest of the sweet potato Ipomoea batatas (L.) Lam. and this weevil is a target of an eradication program using the Sterile Insect Technique in Okinawa Prefecture, Japan. Understanding the population ecology is essential in the planning of an eradication program; hence, a host‐plant infestation survey and light trap survey have been conducted to monitor the population dynamics of the weevil on Kume Island (Okinawa Prefecture), which is the target area of the trial weevil eradication project. Seasonal tendencies of weevil density were found in these field surveys, but the tendency found in the host‐plant infestation survey was not seen every year, and the effectiveness of the light trap is somewhat suspect. To confirm the reliability of the tendency observed in these field surveys, the present study attempted to explain the tendency by a seasonal temperature change using a temperature‐based model of weevil population dynamics. The seasonal changes of weevil density differed according to host plants and host‐plant fields. The seasonal changes of weevil density inside the host plant Ipomoea indica and outside the host plants in I. indica fields were consistent with those predicted by the model. However, those inside the host plant Ipomoea pes‐caprae in the host‐plant infestation survey were contrary to the predicted ones, and those observed outside host plants in I. pes‐caprae fields by the light trap survey were not in good agreement with the predicted ones. It was concluded that the seasonal change of the weevil density observed in I. indica and I. indica fields can be explained by a seasonal temperature change, but factors other than seasonal temperature change are needed to explain those in I. pes‐caprae and I. pes‐caprae fields.

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The effect of egg-surface treatment with ethanol on post-hatching survival and development of the West Indian sweetpotato weevil, Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae).

Cited by 16 publications

References 0 publications

Improvement of survival of the West Indian sweet potato weevil, Euscepes postfasciatus (Coleoptera: Curculionidae), by placing absorbent paper on the artificial diet after egg seeding and ensuring air permeability of the rearing tray

Improvement of survival of the West Indian sweet potato weevil, Euscepes postfasciatus (Coleoptera: Curculionidae), by placing absorbent paper on the artificial diet after egg seeding and ensuring air permeability of the rearing tray

High Population Density and Egg Cannibalism Reduces the Efficiency of Mass-Rearing inEuscepes postfasciatus(Coleoptera: Curculionidae)

Population dynamics of the West Indian sweetpotato weevil Euscepes postfasciatus (Fairmaire): a simulation analysis

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